Did you get to watch any of the frame-straightening procedure? It's interesting to see a good frame tech go about his business- - - -reversing the impact stress that caused the damage in the first place. There's a lot of geometry involved in a correct straightening process, sheet metal or frame work. Making a wrong pull just compounds the original damage.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!