It happens when you whiff the CE and then quickly input it again. At least that's how I do it. All that happens is she does the startup for her original CE but then switches right back to aPat.
No, I'm fairly sure the glitch is Elysium's CE wings coming out during a copied aPats CE. That has not happened before when I've swapped her with other styles.
This is a weird glitch that happens when you give Elysium Edgemaster's style and she copies alpha pat. This glitch only works on aPat, Nightmare, and Algol. I think it should work with regular Patroklos too.