These kids that make these videos should be shot.

He doesn't respond to the ref because he's trying to get his sponsered jacket/waistcoat on, as you clearly see him wearing in the next clip.

The next clips clearly show him trying to zip it up, hence the pulling away from the ref.

Finally, the wraps have been signed off, so why would the ref be suspicious? And if Kovalev had something to hide why take his gloves off?