I have to admit, despite not being a huge fan of Hitsugaya, he looks pretty damn epic with the partial hollowfication and bankai. Urahara’s trick seems to have been successful as the bankais’ completely return to their captains and Cang Du and BG9 are caught off guard; however, I was under the impression that the bankai took significant effort and reiatsu to use – not something that could easily be done while heavily injured. For example, Soifon has mentioned before about how taxing it is to fire her nuke, so it’s difficult to believe she could do it while on the verge of death and being penetrated multiple times. Generally in Bleach, attempting to use high level powers in a weakened state also weakens those abilities and the strength boost they provide. While Hitsugaya seems to have mastered Hyourinmaru to a higher degree since the last time we saw it, it’s still pretty impressive that he was able to just get up and blast away Cang Du at full power. In addition, it’s a little strange how surprised the quincies were at the sabotage and how little they understand of the true nature of the bankai; given that they developed the bankai-stealing medallion and were able to use it so effectively, the Sternritter really should have a stronger understanding of whatever mechanism it uses. This wasn’t the first time their medallion has failed either: Kiruge’s incident with Ichigo should have alerted already them to potential issues if they weren’t already aware before.
This development was clearly meant to show how the tables have turned on the Sternritter, and while they both did get pretty badass lines in, I also find it hard to believe the quincies will go down like that after losing the bankai’s they stole, and especially not in just one shot. They’ve been shown to be so powerful time after time and able to decimate their opponents with just a few strikes (bankai-stealing or not), that they certainly have more secret forms in store for the shinigami. I’m expecting something around the lines of “You thought you could beat me with just a bankai? That didn’t hurt me at all!”, before pulling out another overpowered ability and stomping the captains. This is made even more likely by the fact that none of the other characters’ battles have been shown yet, so there are still a lot of major power-ups to be revealed.