Yeah, there is definitely a hook of some Into Thin Air type of a thing where the protagonist has to plan out a further excursion up the mountain and against the altitude sickness and dangerous enough weather to kill the person even without the yeti, so that the yeti moves away from some bottleneck point and the protagonist can circle back and get behind them and have an opening for both moving further down the mountain and away from the yeti. You could really pull off a man vs nature and man vs man (yeti) dual antagonism that would work really well.