The priest says he's fine. And sure, there's no immediately visible danger or something that he can see- but that doesn't have to mean anything with humans. They're such... fragile little things when it comes down to it. They don't make their own bodies, and as such they're dreadfully unaware of how they're put together and how they work. If Zach would manage to break a rib, he would know. It comes with having a body that he consciously shapes himself. With humans... He's heard enough stories on the street to know that 'I feel fine' can still lead to plenty of unforeseen complications- some deadly.

All of this flicks through his mind in mere moments, and he realises he's been frowning for several seconds at least. 

He sighs and sets the first aid kit down again. 

"Fine. Just... can you at least try to not overextend yourself? On purpose at least?" The priest is radiating waves of discomfort at having some skin exposed, and Zach didn't want to make him all uncomfortable just so he could be at peace that the man wasn't bleeding internally or whatever other way human bodies could mess up. Whatever relief came with confirming that he was okay would undoubtedly be tainted by the jerky sense of discomfort Zach could already feel skittering under his skin. It was usually easier to shrug off unwanted human emotions, but it was now biting him in the ass that he'd been getting more attuned to the priest over time. 

"Can I at least help you getting dressed for bed, or is that too much touching as well?" He adds sharply. He's been drawn into worrying about the human, but that doesn't mean anything. He's can't forget his mission and this just makes it more clear he needs the priest to stop putting him in the same mental category as Sarah. He keeps up the narrowed eyes for a moment, then lets out a deep sigh, relaxing his shoulders and rubbing his eyes. 

"Shit, sorry, forget what I said, okay? That's not fair of me. You've been very kind to me and not all... 'religious' or whatever and it doesn't matter that you don't like me around. It's fine. I'm fine."