Cassius left after hearing Aila's thoughts. She had a few plans up her sleeve, each falling under if the first plan, or second plan or third did not work. He admired her for such a young Queen; he did not expect much when he first laid eyes on her.
But this also meant he had to change his plans and rescue a pathetic human before he could take her half willingly and going through with the rest of his plan. The hunters were also becoming bothersome, and he needed her stronger to become what she was meant to be. What Amelia had planned for her bloodline to be.