You'd just have to get him angry enough that he wouldn't sleepwalk to a UD loss. But if Parker went in there wanting to hurt Usyk he would knock him out. Parker has a granite chin, tanks bombs, he did get dropped by Whyte left hook when he was half concussed and got up at a count of 1, and Chisora flash kd with zero effect but he will just walk through Usyk's pit pat. He's also quick enough that he can hit Usyk, probably pretty easy if he just let's his hands go. It'd be like a heavyweight version of Amir Khan vs dimitry salita if you remember that.
Even if we saw Parker go into "Hulk SMASH!" mode, I just think Usyk would just level up to "Mad Titan Thanos" mode and put a beating on Parker by using his aggression against him and land hard counters.
It is easy to hit Chisora who is technically not well-honed, Usyk is to slick and technicaly to gifted, he would successfully defend against Parker's attacks.
Parker is a nice fella. I don't think I've ever seen him "angry" So your asking for something that doesn't exist. Oh and no he doesn't spark out Usyk.