This happens in all videos of spacecraft launches into Earth orbit.
Don’t tell me that it is “ice falling from the engines” – ice does not change the speed of flight, and even less does it change its trajectory and direction by 90 degrees.
It’s not ice, it’s not satellites, it’s not “space debris,” then what?
The answer is obvious and logical, if you think logically, not with clichés from TV about “we are alone in the whole universe!”