He's happy when he sees the other beast, satisfied that she's okay. But the person she was fleeing is still here. They still need to deal with him, and then they can feed. After a moment of looking at the creature that was once Luz and being satisfied that she's okay, the serpent turns his attention to the human and hisses.

He's huge, but a few things do work in Varian's favor. Though he can move on land, he's not as fast as he'd be in water, and he's not as fast as he'd be if warm. Still, his attention is focused on Varian, and he's beginning to slither closer.