MC willpower have strange swings, his intelligence was probably affected by the debuffs too as he wanted to get the skill crystal in the trap floor but had no way to get out of there, and his chances lowered with every death.
Anyway, mistake in this chapter, MC got his cranium blowed out in a single istant, is impossible to know for sure as there is no that can say it but getting your brain oblitared probably doesn't actually hurt.