LogFAQs > #926064306

main thing to remember is that Brad Pitt represents a bunch of real life stunt doubles.
for that scene it's likely referencing Gene Lebell's little skirmish with him when he was working as a stunt double for a movie and proceeded to dominate Bruce Lee via headlocks and a fireman carry.

from there the rest is just taking liberties by changing the fight style and making his opponent a former Green Beret instead of a judo master.
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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.