Trish wrecks everything except Blitzes, whenever one of those show up it's like a coin flip as to whether you die or not, but as long as you stay alert and don't get too unlucky you can hit them with a Pandora laser. I have no idea how you're supposed to beat the double Blitz fight without getting lucky.
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https://www.youtube.com/watch?v=EFtSLNbecjU