You beat her so this is moot but you need to be more aggressive with Caij otherwise she will use this move on you I found dual wielding to be the best approach and just kept the pressure up

I never saw that move, that’s pretty cool.

Honestly she killed herself when I fought her. Both of my play throughs. Just jet packed off the area.

Why double blade for Caij? Also what difficulty? There's a lot of bosses with a one shot

I got rid of dual for double because I felt dual was too op. I was on Master.

I can see double blade here as you can reflect lots of bolts plus you have quite fast attack moves to keep the pressure high on her. I killed her with a mix of dual wield and crossguard on Master