Life or death............I'd do everything in my power to help. If it came down to leaving him if it compromised the safety of someone in my party, he's on his own.
Yup, if you have put yourself in that position you probably have already decided on that scenario or you are low level peak bagger who shouldn't be there. Choosing to play in that unforgiving environment includes acceptance of the fact that Mother Nature does not care about you.
#prioritize
mike r