If zombies were chasing me, and I tripped my best friend, and he got devoured, I would also get devoured soon after, and die feeling more guilty during those few minutes than most people do their entire lives. If I didn't trip my nest friend, we would be devoured anyway, but at least there was no betrayal between friends.
Also, if I tripped him, I might accidentally stumble too, or he/she might get mad at me and grab my leg, pulling me down with her/him!
I'll run as far as I can...till I can't. Than I'll just turn around and let them devour me. Let him have a chance to flee. But if he can't carry on, I'll pick him up and run.
A good friend will call you when you are in jail. A best friend will bail you out of jail. A real friend will be next to you saying 'That was freaking aweomse!'
hmmm... I see no point in tripping my best friend to get away from zombies. if it's a horde, then only one or two would be slowed down anyway, and I would have to worry about the remaining 10+.
but, no. can't say I could live with killing(that's essentially what it is, no?) my best friend.