Looks like the game's in "attract mode" here, i.e. what happens when you let the game idle at the title screen for a while. The glitch looks like it involves the AI Green Arrow activating the roomba offscreen even though the roomba had not reached the proper location yet. You can see after the dash that Green Arrow presses the roomba button followed by an off-screen explosion. I'm guessing this is a bug with the stage and possibly only doable with the AI and/or non-power characters.
Edit: It's a mixture of the AI thinking that the roomba "should be" at a mid-screen location combined with the game "correcting" green arrow's position relative to the roomba after the AI decides to interact with the roomba but before the activation animation starts.