"Okay. I .. won't?" Though he had touched them, they just hadn't done anything. At least the fact that he's always in his armor seems to be keeping him protected from whatever it is Cole is talking about.

He doesn't know what Lyrium is but he understands enough to realize that this is passed from person to person somehow, and that it's bad and making people forgetful. That's more than enough for him to be very, very concerned.

"Hanzo."

He shouldn't have left him. Turning he runs back to his room to check on him, make sure he hasn't gotten worse somehow.