It sure looks like J.T. is trying to talks some sense into Vincent. Odds are pretty good the subject is Catherine!
Tough luck, J.T. Tess places the character under arrest in this scene.
Tess and JT are featured in this Beauty and the Beast scene. It's from the episode "Don't Die on Me."

Beauty and the Beast Quotes

Vincent: I am such an ass.
J.T.: Can't say I'm gonna argue with you there.

That's fine. You save J.T.; we'll save you.