well, in the end it was easy for him. I mean, he was the son of god, he knew first hand what was waiting for him after his own death.
i don't believe in afterlife, therefore it would be pointless for me to sacrifice my life for the life of an enemy for such reason. I can do that for the life of a friend eventually, but why an enemy?
I can understand in some situation "love your enemy" may come handy for me too, but if we're talking about a life or death situation where he put me in, than between me and him, i pick me every single time.