Aster walked inside the mansion leaving the kid behind, meanwhile goblin kept Uriel pinned to the ground and Clayton, the nearsighted hunter, pointed his gun at Uriel waiting for her to come back. The fact that Uriel was their fellow apprentice didn't make any difference when it came to safety and they weren't willing to take any chances. If he was indeed a killer, they would have to get rid of him on the spot for the greater good.
It wasn't the first time that Uriel felt his fate was completely out of his own hands, he was also no stranger to the feeling of being powerless in such situations, but for some reason he felt particularly hurt that his fellow apprentices wouldn't even listen to him.