The further determining of is-she-or-isn't-she Tosh
Continued from here

As expected, John returns to the medbay not long after he left. Jack hears the "did you miss me" call, rolls his eyes, and turns his head to call back, "No! You'd have to be gone a lot longer than that." And seeing the blood on John's face, he opens up the drawer with the bandaging in it. "Want to get cleaned up while I configure it?"

He figures Tosh and Ianto have heard the commotion and will be expecting them back up at the sofa, but he wants the equipment ready to go first. And it wouldn't hurt to re-familiarize himself with it, too, so he can better answer any curious questions they have about it.