It’s called a fatal funnel and is as basic as it gets for tactics. Easily defeated by any SWAT team with flash bangs and smoke/nvg. He setup two cameras to monitor the door, hardly difficult. To be honest you can learn all this playing Rainbow Six or being an avid reader of Tom Clancy etc.
Stephen was a smart guy and it’s really not hard to learn this stuff on your own.
I don’t see any part of his plan that required assistance.
We shall see.