Previously in the Ice-Fire cave, as instructed by his Spiritual Sense, Xinzi's Klesha Heart settled on a rank three Mysterious Beast to demonize: a Snow Direwolf. The remaining Evil Qi in the True Devil's power orb was enough to turn a rank-three mysterious beast into a rank-six Ordained Demon Beast bound to Xinzi's Klesha Heart. But while our monk could have invested it in higher ranked beasts to produce a stronger demon, he had to keep the demonic creature at a level that wouldn't turn the whole Yanzhou upside down. Rank-six was the perfect mark.
Most rank-three beasts couldn't use human language, but this didn't prevent their intelligence and cunning to match—or in some cases outmatch—their human enemies. So when the scrawny direwolf saw a dark-purple skeletal hand wielding a pink heart, its first reflex was to run.
For those who forgot, Mysterious Beasts cannot—usually—go above rank-five unless they receive the blessing of a Saint, Devil or God. In this case, Armored Lion King received a True Devil's blessing through Xinzi's manipulations.