Mir's method of soulbeast training was actually not that tough to crack. He simply abused the hell out of Murray's diary.
During his last 36 hours in the training cabins of the Church, he and Murray had run countless experiments with Mir's ability to invade and change the dream of any creature nearby.
The beginning of that training period had been mired in frustration, because Skin-leeches, despite their mutation putting them several steps ahead of ordinary leeches in the evolution scale, didn't have a neural network developed enough to dream the way humans did. Their perception of the world was far too strange and simplified, to the point where Mir could not interpret anything in his soulbeast's 'mind' while it was in one of its inactive periods.
It would be a stretch to even say that the soulbeast had a mind as a Skin-leech. It was just a creature running on instincts and simple nervous activities.
