I'd actually put my money on Supergirl for this. If the events were different, and the trio were bloodlusted with their morals off, then a case for Barry just vibrating his hand through her brain/heart during a speed blitz could easily be made.
However, as all of these characters are in character, and there is no plot-convenient interference, then the team's only hope of victory (Barry's vibration) cannot be applied. Due to this, even accounting for Oliver's many different arrows/tactics and a super-sonic punch, I don't see any way the team can win.
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