Found this funny safespot during high score play on normal mode.
This is actually hard to do if you want to go for it, it's really precise but i accidentally got it.
Destroy the right side of the boss minion earlier before you get hit by it, get closer to the left side minion then proceed to pointblank it, don't move before the boss activate the spiral pattern while you're draining the minion in the left side and let go off your finger and let the game do its job. (i assume it might work with heaven mode but idk, will see about that)
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