Blades of Time Discussion
Trainer Tools and Resources
The trainer crashes at the point you mentioned, you have to beat the boss without it sadly.
If you stay in the corner against the wall, dash in, time rewind 3+ times, dash out before his aoe attack and repeat - he should be very easy to beat.
Play for a while without the trainer after the boss, and it should work just fine afterwards; I have had no crashes since that boss.
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