What happens when the Yeti left the game in the Yeti Hunter game
Yeti Hunt is a brawl exclusive to the Winter Wonderland seasonal event as of 2017. It is a 5v1 fight taking place on the Village section of Nepal where five players (all playing as Mei in her Yeti Hunter skin) must hunt down the Yeti (Winston in his Yeti skin), at the risk of the Yeti powering up and killing them in turn.
Yeti Hunter is described to be Overwatch's version of Evolve.
Upon beginning Yeti Hunt, players are given the option to play as a Hunter or the Yeti. Players who have played consecutive games as Hunters are more likely to be assigned the role of the Yeti. Open fireplaces located around the map will spawn pieces of meat over time at random, which the Yeti must collect to activate his ultimate ability; selected fireplaces will be indicated with a countdown timer before spawning meat. The game ends in the Hunters' favor if they successfully deplete all of the Yeti's health, or in the Yeti's favor if he kills five of the Hunters.
If too much time has elapsed with no victory, the capture point in the center of the map will activate.