Raph had excused himself early, which was unusual but everyone understood. Being mind controlled by shredder had to take a lot out of him.

With a sigh he dropped  onto his bed, thinking about what had happened. He couldn't describe it if he tried. He remembered everything clearly, even what he was thinking at the time.... And he'd be lying if he said he'd hated it all.

Under Shredders control he'd matched Leonardo, and almost taken out Shredder himself single-handedly. Shredders control made him powerful and there was a secret, dark part of him that revealed in that power.