What does the manual say?For fun, I checked my P-40 and P-47 pilot handbooks (both original and given to me by a friend who flew 47Ns postwar).
The P-40 says to raise the gear "...when a wheels down landing cannot be done on the remaining runway".
The Thunderbolt book just say to raise the gear "... when definitely airborne".
This Mustang is definitely airborne.
Of course some pilots have the attitude...
"We don't need no stinkin' manuals" (with apologies to John Houston's "
The Treasure of the Sierra Madre").
Still, with the cost of a Merlin overhaul, new prop and radiator being what they are, I wouldn't have done that without a very good reason (which this pilot may of had).
I won't second guess him since he has more time in a Mustang than I do.