This is the scariest face Garak has ever made. I maintain that this should've been the moment where Sisko realized, "Oh shit, I'm in too deep, I need to get out." Because anything that makes Garak drop his Customer Service Face is serious. And note how as soon as they seal the deal, Garak has his Face back on:
If the first picture didn't tip Sisko off that Garak had ulterior motives, the second definitely should've.











