Holy crap, unless that was solicited and the pilot previously asked for help, or they knew each other, that is the most idiotic, dangerous, and obnoxious hero-wannabe cirrus "intercept" I have ever seen.
Cirrus: "Retract gear to minimize drag."
Arrow: "I'm trying to slow this thing down."
"Retract flaps" (when 4 ft above ground? bad calculation of aerodynamic drag vs braking effect). Yes once at TD that is best but for shortest landing usually better off keeping it in air as long as possible which dissipates most energy at high AOA.
The poor other pilot would have been fine without this guy creating additional danger and distraction.
I'm not sure I give him a pass. Maybe I don't have the whole story, but that video looks awful.