He moves as Steve approaches, like he's expecting them to start attacking each other and is confused when they aren't. He doesn't take in the hand motions as a way of communicating, face twisting into a scowl as he hauls his hand back to punch before realizing that, whatever he's doing, it's not an attack.

He looks up when Steve points up; when he looks back, it's suspicious, like he's warning Steve not to try anything funny, before he turns fully to the side of the crevasse. He contemplates it for a moment before suddenly trying to grab the side of the ice, forcing his fingers in to make handholds, and trying to haul himself up.

Unfortunately, he's incredibly heavy, and the ice just crumbles as he looks angrier-- angrier, but not like he's about to start rampaging, just that he hurt his Hulk bum.