Watching the video (granted, just once), it looks like the officers try to put him in a standard position used to subdue active or aggressive persons without injury to either party. So they were probably as surprised as anyone that injury resulted. If this technique was used, there will be no intent to harm. However, having/ordering him removed from the floor is a big issue. And using that technique on a non-aggressive person, or especially, ordering it to be done, could have legal precedent. Maybe the insurance the GOP had to pay to hold the convention will take care of the medical bills?