Ya about that step 4... is the staff member right outside the door? Cuz as I've said, by the time you actually find somebody and bring them down, it's likely all over and he's on his way.
Then step 7. Not a fair position to put them in, unless they are combat trained, but you seem.happy to risk their lives. I would also expect that things got violent around step 2, which you seemed to not anticipate? Like, I get UKers think everyone is docile, and maybe they are over there, but over here the fight comes faster.