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Several of Joker's henchmen were present during Gotham City's 200th Anniversary Parade. Two of them released Smylex from Joker's Balloons. After that, they were supposedly shot down by Batman with the Batwing. None of them were knocked out or killed by Alexander Knox. Two of them held onto the ropes of the balloons and were lifted into the air, they then let go of the ropes and plummeted to their deaths.