Though it might be a bird call, Vincent can't help bit think it sounds a little like a car alarm too- It's impressive none-the-less. Vincent nods back, and Kaoru can tell when looking at him now that he seems a little more tired than before, hair slightly less neat and eye bags a little darker.
And Vincent does catch it, though not perfectly as his arm doesn't come up quite as far as he meant it to because of the stiffer restriction of the straitjacket, making it land in the crook of his elbow instead. He blinks at it, though, definitely not having expected bandages to be what it was.

"You… why do you have these?" Surely hadn't been ordered for him, right? Or had Kaoru gotten them another way? But considering the fact that Kaoru had seen what was under his bandages before as well as the fact that he was nearly out of them, the implication of tossing him these is clear enough. "…Thank you, though. I'm out of my own roll now. Do you want the unused of this one back later?"
He pockets them for now- He'll have to be in the shower room to use them properly on his neck anyhow, which he's sure Kaoru's realized too. In doing this, though, his eyes do linger on the now wedding ring-less bandage on his left hand for a moment. Ugh, he didn't wanna dwell on that too much right now, so he glances back at Kaoru.

"Were the bandages the only reason you were looking for me, then, or was anything else on your mind?" The two of them were both Unforgiven together now, so Vincent can at least imagine that Kaoru's also dealing with some shit like he is right now.