Bruce is bewildered, concerned, somewhat lost himself - but he isn't frightened or panicked, and he does at least respond both to Zerxus' state once he's back.

Albeit with a little more direction thanks to his Father than he might have otherwise managed. He uses the hand on Zerxus' neck and pulls him solidly in, puts a second hand on his back.

"Breathe. No one and nothing is in immediate danger." For now. He is (or feels) bad at this, but his hands are steady and his voice is low and calm.

What was that?