Serious Questions About Bird Poop Jellyfish

Let’s just say it’s poop/splat.

Would the splat change size like It does in the video when the camera zooms out? I’m trying to understand this.

Why would it change color like that? The only thing I can think of is glare, but I’m not very smart and that doesn’t seem reasonable looking at the video.

I saw another post about the targeter and I can’t get that out of my head now. If it’s poop, then why does the reticle have to move at all?

My last question is why does it seem to move independently of the background? I think I understand about being able to zoom in on an image and then move around the reticle within that zoom – but what I mean is wouldn’t the splat move at a consistent pace across the background? It doesn’t seem to do this through the video and it appears to me that this is why the reticle is moving around in the first place. I genuinely don’t understand cameras very well though and I’d just like to hear other people’s thoughts on those questions. Can’t sleep.