Oswald was removing the shells manually because one of them had split, preventing the removal of them all at once by the extractor.
First off... Domingo Benavides DESCRIBED the killer ...And he said the man had his hair cut in a fashion that made the back of his head appear to be flat....Lee Oswald's mug shot shows that he had a very pronounced tapered skull at the rear.....Benavides definitely was NOT describing the back of Lee Oswald's head.
Second.... You obviously know nothing about the S&W revolver ....The rim of the shells are recessed into the cylinder ...... They can't be merely picked out and removed with your fingers....Since the 38 in question was an old revolver that had been modified to fire 38 special ammo the chambers in the cylinder were oversize and too large in diameter to hold the 38 special cartridges tightly,... and this sloppy fit allowed the 38 spec cartridges to balloon in the chambers when they were fired. This "ballooning" of the shells caused them to stick in the chambers and made them difficult to extract even by using the extractor, and impossible to remove with your fingers....
Bottom line... The killer was NOT Lee Oswald.....and the killer was not using a Smith and Wesson revolver....
I just read something interesting in a document about Lee Oswald's arrest.......There were three live cartridges in the revolver that ALLEGEDLY was taken from Lee in the theater....What's interesting is the fact that Tippit's killer was NOT Lee Oswald, and the killer was NOT using a S&W revolver..... But THREE spent shells were found at the scene and there were THREE live rounds in the S&W revolver....... And three of Hoover's "Extra Special, special agents were in the theater at the time...
I just read something interesting in a document about Lee Oswald's arrest.......
Notice that THREE cartridges were recovered......