The reply makes the packed supplies clear. They had been intended for Julian, for his getaway. The doctor had returned and used things he'd gathered and hoarded for himself on Garak instead. Why? This frustrating, infuriating man who shot him had come back and deliberately lowered his own chances of survival. And Garak doesn't want to see him go.

"What did you do?" He has to know. Maybe there's some other way out of this, something that can be used for Julian's sake even as Julian has clearly done something against the system that keeps everyone alive. Can he really prioritize one man over justice for this? Over stability?

"What did you destroy, or who did you kill?" Can there be recovery? And if he finds some way to help Julian, what about the next time the doctor attacks? Anything Garak tries would be untenable. Julian is almost definitely already dead and Garak hates everything about today.