Refusal. That's what it was. When he had formed the Phantom Troupe in Meteor City those years ago you were the one childhood friend of his that refused to be apart of the killing and theft he promised. Thus, him, his troupe, and you all parted ways.
He never expected to see you again, and under such circumstances no less.
It was the night of avenging Uvogin. The night of stealing all the goods in the auction house, killing the attendees, and blowing up the building around. Death would litter the streets and no one would be spared. That was the plan.
But now, as he caught glimpse of a face he hadn't thought of in so long, he couldn't help but pause in his tracks and take in the person you had become. Before he knew it, he was walking down the hall in your direction