He doesn't need to call out; Ianto's eyes have barely left the door through this whole ordeal and the second Jack steps through it he's already out from behind the desk and hurryin over, naked concern on his face. When he wraps his arms around him it's part comport and reassurance, part support to get him to the nearest chair.
"What do you need me to do?" Because if Jack's going to die he doesn't need medical attention but he can't bring himself to say that.