Help with you-know-who (warning: episode Aigis spoilers)

So, I’ve been fighting the Joker super boss (which has been awesome) and I seem to keep getting stuck at a certain point.

It has to do with his down-shot move combo. I’ve seen conflicting opinions online about this, and I wanted some advice as to what I should do.

Every time I have gotten so close to beating him, yet I always miss the mark by just a little. Any help would be appreciated.