Correct.
There is no mention of an armed citizen response. But that is expected as government lawyers did not want any mention in the document of indicating citizens should defend themselves with a firearm if so armed.
“As a last resort, attempt to take the active shooter down. When the shooter is at close range and you cannot flee, your chance of survival is much greater if you try to incapacitate him/her.CALL 911 WHEN IT IS SAFE TO DO SO”
The writers probably invision (as they sit back and ponder the situation)perhaps a larger, late 80’ies model phone, with which to assault the perp, while dialing 911.