Ok, Stuff in the Seireitei is getting messed up. The sogyoku hill is exploding, ETC.
Ywhach is doing some weird shadow thing, and asks Ichigo why he didn't get himself healed. Good question, Ywhach. He thinks it is because ichigo wouldn't have been able to catch up with Ywhach if he had waited.
Ywhach makes it clear that Ichigo is basically nothing compared to him, and Renji comes back with a brilliant response and goes bankai. It lasts longer than Ichigo's did, but thats not saying much. Renji is down for the fight, missing an arm. Lol.
Ywhach states that "All bankai have been destroyed in the future". Could be a translation error, could be him just blowing up all of them. Either way, Aizen attacks him now, and somehow got his sword back. Aizen summons an EPIC DRAGON! Ywhach, in response, and just to drive home the point that he is F***ing OP, breaks Kyouka Suigetsu, and curbstomps the shit out of Aizen. Huh. That happened.
Ichigo attacks Ywhach, seemingly thinking that fifteenth times the charm. Guess who wins. Ichigo also seems to have lost an arm at some point. Ywhach gloats a bit, and shatters Tensa Zangetsu. Again. That sword is very unlucky.
Ichigo gets a second hole blown through him, and theres no Orihime to shout "Kurosaki-Kun" Until he hollows out. Ywhach tells ichigo that his attempts to stop him where Mildly amusing, then does him the courtesy of starting to destroy everything. Thats not Courteous, but ichigo doesn't correct Ywhach.
SURPRISE! All that was an illusion! It was really Aizen... getting curbstomped. Still, finally, a bona-fide weakness for Ywhach. ****ing with his eyes does work after all.
FOOM! Ichigo does something! Guess what it is? Hint, its Getsuga Tenshou. And therefore didn't work. Now that we know he has Getsuga Juujishou up his sleeve, Yhwach is effectively immortal until he takes a Getsuga Juujishou.
I want to point out that during the illusion segment, Only one person attacked at a time, and after Renji lost his arm, Aizen and Ichigo were both missing the same arm. So i'm still guessing that Ichigo and Renji hadn't arrived yet, and Ichigo impaling Yhwach from behind was his entrance.
Unless Aizen is just ****ing with us and the reader has been under an illusion since the Soul Society arc.