1. Why is the drone operator following this particular person, what is the purpose of his mission?
The drone is clearly focused on the the vehicles, zooming in and out on them, and the bicyclist is in the lower right corner most of the time. Only after the shot did the camera zoom in on that location.
You are wishful thinking. The drone operator follows the person on the bike, sometimes being distracted and giving a more general view of the column of armored vehicles.
Nonsense. The drone operator doesn't seem to have noticed where the bicyclist went - at the end the camera was zooming and panning trying to find what the Russians were firing at. And about 30 of the first 90 seconds (before the shot) the bicyclist wasn't even in the frame. You seem to be just lying for no other reason than to waste my time trying to disprove the shit you make up.
You're trying to pull an owl on a globe by giving this video as evidence. I asked four questions about this video, and you essentially didn't even answer one. I hope you are sincerely mistaken, and not deliberately lying in this situation.
When investigating any crime, including a military one, the first question to find the culprit sounds like "who can benefit from this?" If you do not ask this question, then you automatically become, at best, just a victim of propaganda.
Your question had a false premise. The drone clearly wasn't following the soon to be murdered cyclist. Who are you trying to fool?