As an Airman with one stripe on my sleeve at my first duty station, I had to put my name in the hat for low-man-on-the-totem-pole duties every week and often, that required standing in formation for some important Major or above's retirement ceremony.
I've been hit from all sides by a fainting airman that didn't know not to lock their knees and it often looks like that. Don't know if this one was well-timed coincidence or theatrics, but plenty of folks leave basic training and then forget everything they knew about standing/marching.
Air Force formations? I thought they were a myth.
But yeah thats locked knees if Ive ever seen em. My first Plt Ldr took a hard faceplant that took about 25 stitches to sew her up.