Fully justified in the use of force but his technique was poor. If you wait around for an obviously non-compliant subject to cooperate you will usually end up having to escalate when they turn on you. Case in point - it looked like he got bit. Does she have Hep, AIDS or God-knows-what?
The Officer placed himself in greater risk by treating the subject with kid gloves.
Pin the subject, control an arm with a hold, (he did this much) remove your cuffs with your strong arm, and then cuff her flailing arm and ratchet it back to hook up with the one you have under control (hinged cuffs are great for this). It's sometimes easier said then done, but with the right technique it should be a non-issue against a light weight female.
I think these days the public and the media have the police scared to use any force and that can only get people hurt...