Since the binotaur was an undying Alusec couldn't snuff it out of existence like this. Its soul will always heal back after taking injury which was why he needed the soul eater to devour the binotaur's soul completely but Alusec was not ready for that yet. He wanted to put the binotaur in a world of pain before he did the deed.
Alusec waited for the holes to close up before picking the binotaur up and performing the same action over and over and over again.
The binotaur lay against the ground battered with holes. It saw Alusec approaching it and waved its hands as it shrank back in fear, "Enough please, just end me, please... I prefer death over this pain,"