There was a time that no one would say it was ok to leave a friend who was in danger of being killed, even if the odds were greatly against you. Certainly people still did run away from danger and leave a friend to his fate, but they were called cowards. Times have changed. Perhaps not for the better.
susie
I am sure there are many soldiers who saw their friends being killed but could not help at the time.
Running into 50 calibre machine gun fire armed with only your pocket knife screaming, “Leave my friend alone” may be considered brave. But it would also be very stupid.