Isn't it obvious?

[He looks at Ren, and a laugh bubbles up from his throat, harsh and unrestrained.]

I'm finally, finally going to defeat you.

[His voice pitches up higher as he stalks forward, eyes almost glowing behind his red-tinged visor.]

Come now. You didn't honestly buy that whole "repenting criminal" act, did you? These last few months, I was just biding my time, making you trust me, until I could finally destroy you. And look at you now!!

[Another laugh.]

You can barely fight back!! Are you really the same Joker I fought before? Did I weaken you that much? Your attacks do nothing.