Without a reference point it´s hard to tell what we´re looking at.


Let us start from the trivia. Walson intended to sell his footage, involved himself with fellow mystery sellers, but they ended up fighting. You can check some of the public name-calling here. Millions of dollars, Spielberg and such are things involved.
There's much confusion and embarrassing excuses given, but this is essentially trivial. Even if the helicopters videos are indeed real, filmed by whomever claims to be harassed, they would be no mystery. At least according to the definitely not-debunkers folks at the AboveTopSecret forum.
Springer, from ATS, claims that a license plate of a van in the video could be traced back to a company that is located near a military airbase. That, along with the refusal to disclose any actual details of their methods, led to the expulsion of one of Walson's spokespersons (or Walson himself, who knows). The whole case is now tagged as a HOAX on ATS.
Not happy with so many embarrassing moments, Walson actually went to the length of recording an interview with an astronomer. Only thing is that he didn't tell the astronomer he was being filmed, and then edited the interview to make it look like it supported his claims. The astronomer was not very happy about that.