Just barely evading the flurry of sharp rock that cuts up Imogen and knocks Armani off his feet, Aris doesn't need any further prompting to fight. He's pulling back his burner wand to cast when the memory around them returns to life and he stops, visibly startled. What's going on now? Fortunately, the creatures' ritual holds the Cultist at bay for him and by the time the unfathomable events have come to an end, he's prepared.

"Expecto Patronum!" He can't be sure that the spell will work against such an entity, but this Cultist seems pretty dark magic to him. And they could definitely use some protection.