Glass on the outside of door break, Pelosi calls 911 from bathroom and doesn't lock himself in, unknown person opens door for police, Paul back from the bathroom and and now holding a hammer together with David. David hits Paul with hammer only after the cops arrive.
Alternate explanation for glass on the outside of the window...
If using a claw hammer or a hammer with a nail extractor, it is quite possible you just hit the window once or twice, and then rip enough glass outward with the hammer to create a hole that you can safely put your hand through to unlock the door.