[Tachibana]

Spoiler for 59:

So our interpretation of Tsukune losing control was incorrect, the real reason he was starting to lose control was because of the synchronization between him and Alucard's awakening, now wonder he didn't have any problems when he was fighting Kuyou since they were in another dimension, Tsukune was definitely in control, but now thats no longer the case, it's either gain control or lose himself forever.