Off topic but I’ll explain the issue briefly:
This is the trick of fast action vs. frame speed when shooting and viewing video.
It’s a screen shot of a video clip. The phone camera was shooting at x-frames per second (fps) and is played back at y-fps. So, the frame that shows the flame blossom wasn’t played back in a fps sequence that was able to catch the hammer fall that happened a split second before.
This phenomenon is something that often comes up when clips of body cam or cell phone footage is played on the news or posted on the internet. Not every thing is shown and little things get missed based on these video obtained vs video fps playback gaps. It often takes a film lab to forensically slow things down so all the action that was caught on the video is played in a sequence that will show the viewer everything that actually occurred.
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Notice how most of these images have the hammer clearly shown back in them even though these guns are firing, too. All of these were shot using the same iPhone X camera.,
Again, apologies for running off topic but it’s kind of interesting stuff.
Stay safe.