Believe it or not, Jack would not mind talking about his scars. Sure they're painful memories but not painful in the same way as Tenenbaum, as Fontaine. Only the throat one might be going too far, and that's only if Sinclair really pried.

Of course Sinclair can't read this narration so that whole paragraph is superfluous really.

Jack nods, glad to drop the subject. "Sorry, mister Sinclair."