The fact is, it could be a number of people.
Gin: He is certainly powerful enough. He has the speed. His sword looks like that (as do a number of peoples blades). He can easily enter HM. The speed of his sword could make the sand lift like that. It could be Gin. The only thing against him is that he may be dead, but I can do what a few people here like to do, and just throw it all out just because of my opinion. But, I won't, these are the facts presented.
Grimmjow: He may or may not be powerful enough to do it. Just seems a bit strong for his non released form. If he is, he may be fast enough, it is hard to tell. His sword may look like that, in a couple of instances, it does. He would be in HM, if not captured. Would he attack a man from behind like that? Before, probably not, but I'm sure he can grow and make exceptions for the Quincies. It could possibly be Grimmjow. He is only alive because we were told so, or else presumed dead, as he was severely wounded (like the above was). The only thing against him is the power, but he could have very well absorbed someone, it isn't above him, or even trained.
Nel: Seems a bit too much for his non released form, but if the Blut was in offense mode, and he was weak, very possible. Again, seems a bit fast for a non released form. She is in HM. She would help Urahara and Ichigo. Could be Nel, but with the details, and in my opinion, the above two seem far more likely.
These are the facts, you can't really say none of these don't factor in because they do. Unless of course I am wrong somewhere, then of course you could.
I'm very interested to see who it is, but I am more interested in seeing how Ichigo will break free, I hope he used a bit more power to do so. Otherwise we will get one or two chapters of them just freeing Ichigo.
maybe grimmjow ate bodies of nnöitra and yammy, and this gave him great boost in strength
If it is Grimmjow, and if he hopes survive another encounter with a Quincy, he would have to have developed a second release like Ulquiorra. That would be the only way I can see him having enough power to have a 1 on 1 match against the top guys in this group. If he didn't develop a second release form, I guess surprise attacks from behind seem to work for the time being.
remember that a quincy's weakness is the moment they change their blut from defense to offense, sneak attacks while they switch blut modes wont take an uber attack to critically injure. Any reasonably strong character could do this.
btw spoilers are later than usual...can't stand it already!
I think it's Isshin since the last chapter came out. He'd be strong and fast enough, maybe he came in HM after as backup for Urahara.
What im saying is that if the difference in lvl is high enough this is the finishing move Kubo will use. So whoever cut him down totally outclassed him in every aspect, as in force, as well as speed.
It has little to do with how your special little trick works lol.
When Kenpachi offed the time tells no lies dude , i forget his name every time, his Zanpakuto still had no name, and was nothing more then a sword. All his power comes from his body. So thats why i say that the ability doesnt matter, just that the opponent is so overwhelmed or caught off guard that this happens to him. Being sliced in half.
---------- Post added at 01:32 PM ---------- Previous post was at 01:30 PM ----------
when is the chapter going to be release?