User blog comment:Xilinoc/Ch. 686 - Death & Strawberry (End of Bleach reMIX)/@comment-2243814-20160818182335/@comment-5398287-20160818190649

Regarding C, the best answer I've seen is that Yhwach was about to make good on his promise to kill everyone during their happiest moments in the future; however, Ichigo interrupted this by killing him, which is represented by all the accumulated Reiatsu/power/whatever kinda fizzling out at the last second.

That or Kazoo is basically Franklin Richards and can disperse god-tier power machinations with a flick of da wrist. Either one's acceptable imo.