Conan didn't have a good feeling about the man. He knew better than anyone not to judge a person based on their appearance, and he wasn't as good as quickly evaluating a person just by looking at them as Haibara, but there was something off about this man that gave him an uncomfortable feeling in his belly. Maybe it was the fact that he didn't respond to either of the two detectives after they had spoken to him, where any normal client would respond easily.
He blinked as Hattori moved between himself and the man -- he didn't want to feel the need to be protected, but he knew that if they were caught off guard, the Osakan would be able to fend for himself. Conan, in his current state, wouldn't last.
"Hattori," Conan muttered, reaching to grab the dark skinned detective's jacket as he opened the door. He didn't want to let this man inside of Occhan wasn't there -- surely they could discuss the case outside, right? Even if it wasn't as comfortable.
His eyes widened as Hattori suddenly cried out in pain. "Oi!" He reached his arms up to try and support the Osakan as he spun, and his eyes caught the item the suspicious man was holding -- a taser? -- before Hattori fell like a sack of potatoes, hitting his head on the table as he went. "Hey!" He knelt down to shake Hattori briefly before large hands fell on either side of him and hoisted him up in the air. "Put me down!"
A damp cloth found its way over his nose and mouth and he struggled to hold his breath, trying not to breathe what he knew to be chloroform in. But his vision started to waver and his eyes began to droop, and the last thing he was aware of was that he was being carried through the door and out of the agency.. and then he blacked out.