The moment it saw fire coating the sword that the new arrival held, the monster controlling the granny's body immediately turned to run away.
It didn't run away because it was scared of fighting the new arrival. It ran away because it recognized that the new arrival was a strong opponent and would only become an even stronger opponent for it in its current state.
During the fight with Malachi, it had almost exhausted whatever little energy the granny held in a few minutes during the last brawl. Staying to fight another difficult battle it had no confidence of winning would only spell its death.
The monster clicked its tongue in annoyance through the granny as it navigated through several buildings.
"I have to find a new body quickly," it muttered, and the slight desperation in its voice was a little noticeable.