Even as he struggled with his state of mind, Rook was very careful to not end up sinking his claws into the other Kindred has he hung on to him. The contact helped to remind him that he wasn't just the beast. That he wasn't back in that first life. And while he had been feral it had been different because it had been to protect.
"I've never seen a Toreador do that before. I think you just created a new religion," Rook pointed out as he gazed back at Ash. "But no. It tried but my mind was too far gone by then." There was probably some higher brain function one had to have to influence, one that he lacked that far down in the mind of the beast.