Bruce is a little too far away to be heard, and he's not sure whether he should speak anyway. He's well aware that if he draws her attention, he's the least able to defend himself against her. It's not fear for himself - Thor's here for defence - but because he knows how she feels about threatening people she cares for.

Still, he says it in his head. Come on. You can do this. You can do anything. Beat this, so we can go home.

He watches Elle, too. She's so calm. If she can be, so can he.

So he says nothing. But he's willing her to fight on, and he's not going anywhere until she's done.