it does look like the gun malfunctions after the first shot, but he racks the slide very quickly. it then doesn't fire the second time he tries to shoot, and he re-racks to clear a jam/correct a malfunction, and it looks like the third shot fires. then he starts slapping the back of the slide after the third shot trying to get the gun to feed right. it's a weird mix of competence and a shitty weapon, which to me says a premeditated but amateur killer, probably an actually disgruntled civilian. no real hitman or glownigger would have these issues, and some random criminal would not be so prepared plus they would have a motive like robbery or something.
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