Jack can't see the gloves, but he can see the way Ianto's hand is shaking and his tone turns even more gentle as he finishes tying his laces and heads for the door, still buttoning his shirt. "Hey, it's all right," he says softly. "I'm not far - I'll be with you in two ticks."
And then, because Ianto's clearly really upset, he does what he always does to calm him: he sings.