And it doesn't matter if you now instruct me that in "So-And-So Movie" directed by Such-and-Such Director, produced two years before Boorman did Point Blank, there was a similar scene and that Boorman probably saw that scene before he set up his own such scene in Point Blank. Maybe. And Shakespeare stole the plot of Hamlet...what's your point? Nobody can or should be beyond influences. Your choice is to either enlist and reshape those influences for your own distinctive artistic purposes, or just chew the cud of them like a dull cow.
I've never seen the flailing-away scene before. It looks and feels like something that could only have been done by these actors in this scene in this movie. But the police captain chewing out the renegade tough-guy detective, and barking that if you pull another stunt like this, I'll have your badge? That scene I've seen. If the cop ain't Clint, I'm not interested.
David M. Brown is the publisher of The Webzine, and runs the blog for the Laissez Faire Books web site, where he has been discussing many urgently important topics of the highest possible interest to you.