Not sure if there's enough video there to really know what's going on. Every situation, real or drill, has a beginning somewhere, and the video starts far past that. We can't know how long the negotiations have gone on at this point, and that really makes a difference as far as what's appropriate. I do agree on the original point about standing clear of the door and the possibly unarmed officers on the other side... but all in all we need more info.
One thing I'm sure of, though... good that they're at least practicing.