Sounds like something is messed up here.

In most cases this should be avoided(or at least the situation made clear), by clear and repeated announcements that it's in fact (insert name here) doing the raid. Not ahead of time of course, for drugs I could see giving a no-knock warrant, but once you hit the door.

However some weird stuff seems to be going on here. Specifically that the cop was trying to get through the lower panel of a door. Are they trying to sneak in? Also if only two officers were on scene that's not right (though it isn't clear there weren't more). Finally you'd think the guy in front would be wearing tactical armor with better coverage.