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[He actually recoils once he sees Jack on the other line. There's momentary shock, because that's the face of Malcolm Merlyn, he's pretty sure.]
I don't mean to alarm you but I'm actually doubting you are who you say you are considering how you look like one of the most dangerous men I've ever met.
[Also he definitely recognizes that name. It must be a coincidence because the very fictional character he knows looks nothing like Malcolm.]