Here is a basic run throw more talking more talking then we actually get to see some action will not say who but the 9th caption (not tousen) goes and sees a hallow attacking kids this 9th caption comes in and kills the hallow all of the sudden the hallow blows up (kind of like ATHF explosion lol) and in the end you see 10 shinigami uniforms who you think belonged to members of the 9th divison who went out before the 9th caption(vizard today) his people and his rude vice caption(Vizard today) who he almost hurts.
Oh and you get to see the 9th captions shikai.
That is it in a nutshell not giving away some names cause I think its for the best if you read it yourself.
maybe its something similar to the way kaien was taken by that hollow. except they were absorbed into the hollow instead of the hollow taking the body, idk.