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

Vargas:This is where he lives? A chemical plant?
Cat: He's a researcher, maybe he works from home?
Vargas: Or maybe it's a meth lab.
Cat: Just my type.

Everyone told me it was just a coyote or a bear. This thing I thought I had seen was just a result of my concussion or post traumatic stress. No, the men who killed my mother were beasts. I believed them. Until now.

Cat