Misinformed
When that level 79 man stayed behind to protect the core of his group retreat, Minos had not yet identified Abe's position and was fighting his way through the surrounding area.
Emperor Stuart had earlier received information that Abe was likely to appear at this outpost today through one of the enemies arrested by members of his sect this morning.
With this intelligence, he had immediately ordered the group closest to this location to attack this enemy outpost as soon as possible, considering that such information would expire quickly.
Luckily, Maisie's group was nearby, and she had come to this location and promptly established a teleportation port for Minos to come from Dry City to this place.
With that, although he knew of the likelihood of Abe appearing in this place, as soon as he appeared there, Minos had no idea whether this individual was there.