Wish bone?The commentators on Kayo said something about a type of tackle we hadn't seen for a while... can't remember what is was. Turkey thigh or the like...
He didn't wrench or force the leg he had control of though, just Paseka tried to resist and other leg held firm (until it didn't)
Certainly wasn't pretty but as a one off I think it's more of a bad luck and accident situation not something that needs to be charged.