Invisibility Speed

[TheAngryOrange]

Scenario. You are about 5 m away from an average sized human. Suddenly that human disappears for an entire three seconds. Like they turned invisible. After three seconds, that human reappears. What happened was that person was running around in circles in your cone of vision for all three seconds but was moving so fast they were invisible.
Maximum visibility. Actually this person can glow and even when glowing in the dark they are still invisible.

Now, does this count as Faster Than The Eye movement? I was under the impression FTE meant the person just performed an action so fast that you didn't see them move. Or that moved so fast it looked like they teleported. I guess I find it hard to believe moving so fast you are invisible counts as subsonic when you can still see real world hypersonic objects.

 

[StekFence]

when you can still see real world hypersonic objects.

I believe this only from a distance, because from a distance, everything is slower. up close, your eyes probably couldn’t track it

 

[TheAngryOrange]

I believe this only from a distance, because from a distance, everything is slower. up close, your eyes probably couldn’t track it

I should perhaps rephrase that. I was thinking about footage of a a close up of a rocket sled doing 6,500 mph. You don't see actually see it move in any way that can be tracked. But you do get a flash of light from its exhaust as it flies by the camera. Now what will it look like if it doesn't get the chance to leave the cone of vision and instead does circles within it?