No one predicted the sudden aggressiveness of the Rift Monsters, well, except Aldrin. As the leader of their group and perhaps because he still appeared calm despite what they experienced, the Instructors who came to check on them, albeit late, asked him for the details of what had transpired in full detail.
Starting from the sighting of the hyenas that appeared out of nowhere with the hill as their set destination until the point where the 'experts in Battlesuits' arrived to help him lure the bulk of them away including the famed Dreadgnaw.
From them, Aldrin found out that the two trainees who got their Metadomes destroyed somehow survived. Furthermore, they're actually the reason why Faye and her group got entangled with that many hyenas when his group arrived at the scene.
To save the two and let them call for help, they blocked the hyenas with their Metadomes.