It was on the tip of Iain's tongue to say 'there are better contingency plans than heroin', but being a former alcoholic himself, he figured that'd come off as rather hypocritical. And overly harsh, given the circumstances.
"It comes back to what you were telling me last time," is what he said instead. "Ever since he left, you've been depressed and in pain. Is there...I don't know, something about him? Something he does? I don't even know how to ask the question."