…Well, Vincent supposes he deserves to be called that at least in this situation, but at the very least the whole 'focusing on him (and Kaoru) instead of the Wardens' thing was succeeding, so he couldn't be too upset about it anyways.
"No, I'm not a cop, I'm a criminal. …Though I suppose you're right that the two aren't mutually exclusive." Womp womp- But that wasn't what was important right now.
As for what Kaoru has begun spouting off, Vincent is both once more impressed by how brazen this guy was and also put in perhaps a slightly more dangerous position because of it, seeing as he's 100% planning to try to Block any retaliation from the Wardens towards the Sheriff as well. But it probably wasn't going to be anything he couldn't handle if they did, anyways. Yeah, fuck it, he'll back Kaoru up on that.

"Yes, well… perhaps let this be a lesson to you three that following your own orders without question isn't always for the best either. I did overhear Robert give some sort of warning to you that he didn't think this was a good idea," Vincent says with a side-eye to the Wardens. What did THEY have to lose for refusing to participate, huh? But his eyes flick back to the main man at hand.

"Regardless, yes, they're going to get to decide that, and it's currently unknown what repercussions a verdict will have. This process is something all 14 of us prisoners here are being made to do." Counting the sisters separately, of course, why would he consider them just one prisoner- "…I do apologize for my part in attending what happened. It seems like whoever's in the room when it starts gets brought in, and I didn't get out fast enough once I realized what was happening. I have no intention of sharing what I saw with anyone unless Robert himself wants to know."
Vincent isn't trying to force Ei out of the man's hands exactly right now (as long as Ei can still breath, anyways), but he IS standing ready to get even MORE fully in the way if either party does anything Else to each other to inflict harm, be it a tackle, a punch, or worse. If there IS a big punishment coming, Vincent does Not want to just watch it happen to this guy.