Bruce doesn’t have the luxury of being able to literally disappear so readily; he does, however, have ample experience in how to remain quiet and aware of his surroundings, keeping his breathing shallow and shifting his weight so that he leans against his cover, pressed to it so to avoid any unnecessary movement.

(Considering how uninterested they look? It’s doubtful. I think this is just part of their patrol route.)

And he’s right. They linger only for as long as they need to, before moving on. When their footsteps filter away into silence, Bruce straightens, standing back on his feet.

(It’s going to reach a point where we can’t be bothered to wait for them to pass. If we waste too much time slinking around, we’re liable to get blown up sooner rather than later.)

In other words, the next set they run across may or may not have to be knocked out, for the sake of expediency.