"Inform the President upon conclusion of his bike ride"
So a total assholes-and-elbows scramble at the White House and Capitol does not merit any POTUS interaction, even notification. Interesting. This leaves us wondering what does rise to the level of a tap on the C-in-C shoulder. Presumably taking down the Cessna and raining fiery death down on DC might, although it is hard to tell. It certainly looks like the check-list for this kind of incident has presidential pre-approval right up through taking down aircraft deemed hostile.
Or it could be that the decision to take down aircraft has deliberately been moved further down the chain of command in order to insulate the office of the president from the aftermath of such a decision. Like I said, interesting.