Yeah, that's supposed to be Roscoe Brown's truncated Split-S maneuver, where he pitches up his Mustang aircraft to near-stall, and then flips it into the dive to attack the enemy fighter, which was the twin-jet-propelled Me-262, Germany's next-generation air superiority fighter. You can see the battle described in the last of the 4 videos I posted from The History Channel.
I'd also recommend watching the HBO movie, part 1 of which I posted above. The rest of the 11 parts of the movie are there on Youtube, if you click on the video to go there. It was low-budget, using old WW2 stock footage, but still a very charming and endearing story. It has actors Lawrence Fishburne and Cuba Gooding Jr.