Though Blake couldn't be 100% sure, he felt that unlike Kate who had still been conscious of the things that were happening around her, Rehabab's consciousness had been totally repressed and his fury brought out of him.
Blake believed that for all of Lena's power, there was a limit to how much control she could have over people and he was glad for that as this berserk Rehabab, exchanged control, tactics and precision for power and also unfortunately insane battle instincts.
When Blake brought down his Katana on Rehabab, seeing the man move to defend his attack with his right arm, initially had Blake smirking as he believed that he was about to take an arm, but contrary to his expectations, what the infernal demon instead did was move a step closer to Blake and then used his left ankle to collide with Blake's weapon.
As Rehabab's ankle clashed with Blake's Katana he drove his arm backwards, this move having the tip of Blake's blade slice down his forearm.
