Knife hand: Do you still use it?

Not long ago, I was walking the hallway in my unit's building when a two-year-old broke free of her mother running the FRG table and ran down the hall in my direction. Mom gave chase, but the tyke had a healthy head start and showed no sign of stopping.
Not until 1SG Healy deployed the knife hand, that is.
"Hey! (knife hand) Stop running! (knife hand, little girl halts in her tracks) Go see your mommy! (knife hand).

She turned right around and walked towards her mother.
Mom was grateful and said "Thank you".
Victory Secured.

When the knife hand is unleashed, people know that things are about to get real.

Hell, even my kids "knife hand" people!