Depends how good a friend I guess. See, if they're a really good friend they won't mind.
If she's already decided she likes the second guy, then the first guy's chances are now zero no matter what happens. If he wants to be cranky about it, I guess he can reduce his friend's chances to zero as well. If he's really a friend, however, he'll let his buddy take a shot at it.
__________________
.
|