I would've took the knee as well... But when he was talking to the ref Broner was nowhere near him.
And how you protect yourself when you getting hit in the nuts??? He was doing a pretty good job of protecting himself considering he was very close to getting Ko'd until that point
He would have protected himself by taking the knee initially when he got wobbled badly.
Also as for the low blow, if the ref doesn't call it, either you dive and sell it like Bhop, or you hit him back low, you don't look at the ref and wave your hands.
Especially with a shytty ref like Pabon