Nasty ending to St. John's at Seton Hall

[Nevadaref]

Nasty ending to St. John's at Seton Hall.
Lavin gets two Ts in about 3 seconds after yelling at one of the officials.
With about a dozen seconds remaining a St. John's player makes a hard foul to prevent a show-off dunk by Seton Hall, which was winning the game, and John Cahill called a flagrant personal and tossed him.

I'll note that he gave the intentional signal first, before making it clear that he was ejecting the offender, which is something that I've recently advocated in order to make it clear to everyone that the official isn't just calling a common foul since there isn't a signal for a flagrant foul. I would like to see the NFHS add that signal this summer.

What do others think?