he'd compel him to lay low, most likely, with intention to stick with him until the heist/recon team reported back that it was safe for him to let t-rex go, at which time he'd compel t-rex to believe he'd been on the fair heart doing a surprise visit for Reasons

idk if it'd come off as too metagamey so the mods can approve/deny as they see fit but i do feel that damon would suggest they take whatever t-rex has that passes as a phone, and then compel him for things they should know before they left