Puzzle challenges!

[GunChleoc]

And Caladbolg wins, although I do like the Wesnothy pike answer

[Ephraim]

The spy:

A spy wants to enter the great bastion of Elensefar. However, because it is well-walled and well defended, there is only one way to get in: telling the guards the password.
The spy hid behind a large rock, and saw a knight on a horse. He was dressed with a fancy steel armor and a layer of leather adorned his back.
- (Guard) Stop! Who is going?
- (Knight) Hail! My name is Sir Galahad, of the lands of the east.
- (Guard) Sir Galahad! For six days we were expecting his arrival!
- (Knight) And I hope to resolve quickly the matters that bring me. My three children and my wife are waiting for me at home.
- (Guard) I wish you luck in your work. Pass!
And after a great rumble, the doors opened, letting the knight pass by.

After a short wait, a beggar approached the doors of the bastion.
- (Guard) Stop! Who is going?
- (Beggar) I am a poor man who comes to shelter this city ...
- (Guard) We'll let you pass if you say how many of the twelve arrows that were in this quiver remain in it!
The beggar thought for a while ...
- (Beggar) There are five corpses on the ground and a trail of blood, so ... There are six arrows left!
- (Guard) Wow, that's right! Pass!
And after a great rumble, the doors opened, letting the beggar pass by.

The spy was meditating for a long time, and at last approached the gates.
- (Guard) Stop! Who is going?
- (Spy) I am a merchant looking for goods to be able to sell.
- (Guard) In what we have of day already have entered eight merchants in the city. We should have good products!
- (Spy) Of course! Of the four cities I've been trading in, this one is the best!
At that moment, an arrow shot out of a guard's bow and pierced the spy's heart, killing him instantly.

Why did this happened?

Note: If you already know this riddle, do not even say the answer, let the others think.

Solution and winner:

Nobody could solve it, but there were many interesting answers. There is the correct one.

[Zap-Zarap]

If the spy'd have answered: "This one is the best of the four cities, i've been trading in.", then he would still be alive, right?

[Ephraim]

If the spy'd have answered: "This one is the best of the four cities, i've been trading in.", then he would still be alive, right?

If the guard killed him (and yes, the guard killed him) that means the spy said something wrong.

[Caladbolg]

Here's my reasoning:
People can only enter when they give the correct password. Therefore, their last lines should contain the password. If we look at the last lines of people A and B, the only thing that they have in common is that they mention some numbers. Now, all of the dialogues are a bit strange and we notice that before any person gives the password, the guard's line also mentions some number. So, let's look at the numbers mentioned:

Conversation A: Guard- 6 days; Knight- 3 children and a wife
Conversation B: Guard- 12 arrows; Beggar- 5 corpses and a trail, 6 arrows
Conversation C: Guard- 8 merchants; Spy- 4 cities

It seems to me that the guard asks a question containing a number X and the person needs to respond by mentioning a number that is X/2. What I don't get is why the Spy didn't get through, as he answered correctly (8/2=4).

My guess would be that it is because the other answers also refer to things that are not included in the correct number: person A says 3 children (correct number) but also mentions a wife; person B says 6 arrows (correct number) but also mentions corpses; person C fails because he gave the correct number (4), but doesn't mention anything else (instead he says "This one is the best", refering to one of the cities that are included in those 4).

I think I get it: the last number a person says needs to be half of what the guard says. Person A says 3 children, B says 6 arrows, but the spy says "Of the four cities I've been trading in, this one is the best!" So the last number he said was not 4 but 1 and he got killed

[Ephraim]

Here's my reasoning:
People can only enter when they give the correct password. Therefore, their last lines should contain the password. If we look at the last lines of people A and B, the only thing that they have in common is that they mention some numbers. Now, all of the dialogues are a bit strange and we notice that before any person gives the password, the guard's line also mentions some number. So, let's look at the numbers mentioned:

Conversation A: Guard- 6 days; Knight- 3 children and a wife
Conversation B: Guard- 12 arrows; Beggar- 5 corpses and a trail, 6 arrows
Conversation C: Guard- 8 merchants; Spy- 4 cities

It seems to me that the guard asks a question containing a number X and the person needs to respond by mentioning a number that is X/2. What I don't get is why the Spy didn't get through, as he answered correctly (8/2=4).

My guess would be that it is because the other answers also refer to things that are not included in the correct number: person A says 3 children (correct number) but also mentions a wife; person B says 6 arrows (correct number) but also mentions corpses; person C fails because he gave the correct number (4), but doesn't mention anything else (instead he says "This one is the best", refering to one of the cities that are included in those 4).

I think I get it: the last number a person says needs to be half of what the guard says. Person A says 3 children, B says 6 arrows, but the spy says "Of the four cities I've been trading in, this one is the best!" So the last number he said was not 4 but 1 and he got killed

Wow! That's pretty good... Incorrect.
Grammatically speaking, "one" is not a cardinal number on this occasion, but an auxiliary for "this" (Note: Maybe I'm wrong in this, but anyway, it isn't the correct answer).

But you are so near from the answer!

[GunChleoc]

Is it because he didn't include "and" in his answer?

[Ephraim]

Is it because he didn't include "and" in his answer?

Nope

[Eagle_11]

The spy must have said something 2 + 2 resulting in 4 instead directly 4. ?

[Ephraim]

The spy must have said something 2 + 2 resulting in 4 instead directly 4. ?

No. It isn't the correct answer.

[Zap-Zarap]

I think I get it: the last number a person says needs to be half of what the guard says. Person A says 3 children, B says 6 arrows, but the spy says "Of the four cities I've been trading in, this one is the best!" So the last number he said was not 4 but 1 and he got killed

That was exactly, what i was referring to in my post above, sadly it is wrong.

[Zap-Zarap]

The secret password is "are", spy said "is".

[Ephraim]

The secret password is "are", spy said "is".

No.

[WTrawi]

I came up with the same answer as Caladbolg did... so sad that it's incorrect, it would be a genius answer

[WTrawi]

It seems no one can solve this puzzle (I know it's against the rules, but I know a really-really good one if someone wants a new riddle)