Jonah is seen discreetly pushing Jay into a sinkhole while everyone else is running away from it, manipulatively volunteers Jay to risk his life to get the rest of the group water, and even accidentally throws a knife into Jay’s thigh.

Source: https://www.buzzfeednews.com/article/stephaniesoteriou/jonah-hill-this-is-the-end-jay-baruchel-hated-him