The difficult part is determining whether he "attempted to kick" or "attempted to trip". Sticking out your leg to get a piece of someone trying to get past you doesn't necessarily mean you're trying to kick them.
Now obviously "tripping" is going to be a hard sell considering the height where Petgrave's skate ended up, but there's where the argument of whether or not there was contact with that other player comes in, and how much that affected the trajectory of where the leg was originally aimed versus where it ended up going.
I'm torn on this. On one hand, you can't just be reckless just because it's on the rink and you think that gives you carte blanche to do borderline stuff. On the other hand, it creates a slippery slope for a whole bunch of "dirty" plays that if they result in death (or even permanent injury), would they now be considered for criminal prosecution?