If they have a good reason and are serious, then sure.

Hypothetical Situation: You are in a field many miles away from any civilization. You have no communication devices (cell phones, etc). With you is your friend who is severely injured. Your friend is in extreme pain and will not survive long enough for you to get him/her to safety. Your friend asks you to kill him/her. What do you do?

For me, I would kill them. Trying to reach help is pointless as your friend would die before you can get any, and why would you prolong the pain your friend is in? If the roles were reversed, I would expect the same.

If they were terminally ill, yes because I want not want to suffer. .

I would only do it if they agreed to do a samurai death battle.

I of coorse wud get the final blow and I wouldn't mind getting a few more stab wounds and slice wounds.

I think this is perhaps to do with euthanasia so i will stick to that. In my opinion everyone has the right to live but also the right to die. If a person truly feels s/he cannot bare living any more and they are handicapped in some way that prevents them from doing the deed (whether it be physical or mental), i feel that then their wishes should be met to at least die in a way they want to by someone they can rely on (this doesn't imply to know the person). However the limits for me are if its a cry for attention or that their excuse for not wanting to live was trivial or resolvable, if otherwise then yes i would and i do think i would sleep well about it too. Life should be a choice for the person who's life it is and if they need help with the decision or outcome i think as a fellow human we should try to help, but that's my opinion of course. :)