If Mo Fan did not like the creature, he would just toss it back into the Summoned Beast Plane and let it be. If he was pleased with the creature's performance, he could just tag the creature to Summon it again next time!.
The Black Medusae were afraid of Ice Magic, as they were unable to maintain their body temperature in icy places. They could freeze to death very easily!.
Not long after, more enormous creatures showed up from the same direction. The Mages with wings that were previously on their trail quickly turned around and headed back toward the fortress..