As soon as they take off and go into that 45 degree climb and winged over, looked like a stall to me, as well as the AoA at 3:30
Look at the contrails in that flat turn @ 1:50 or so into the video, amazing! Wonder how many G's they were pulling
Thanks for posting
I see several wingovers as well.
I know it wasn't the smoke
Maybe camera angles are not the best for showing, but sure look like stalls to me.
Then again, I'm not a Pilot.
Oz