I didn't hear the end of the PC, but that's not what he said in the beginning. I don't know at what point you tuned in.
He said she was being verbally disruptive, in an ongoing way, to the teacher and being disrespectful and disruptive to the classroom process. The teacher called the admin, which was what was expected and right in that situation, and when she refused to leave the room for admin, the RO was called and told by admin to remove her forcefully from the classroom. Up through that point, everything was done correctly and he was happy with it, it was as it should have been. The moment the RO went to actually remove her as told, he used the wrong technique, not one that they've trained with, and not one that's approved. And for that, he was fired.
Again, I don't know if he took some of those statements back at the very end of the PC.