He's going to strip off his shirt, and not for the fun reason he'd strip off his shirt; because it's damp and covered in blood. Jacobi can see that there's no wound as he turns and lets out a very tired sigh.

"It's mine. Ulla healed it. I'm fine. I... probably would have healed by myself, to be honest, but I wasn't about to tell her no. Conidering."