[Red Steel]

I still don’t get how the noise of the approaching choppers didn’t alert them and give him some time to try and make an escape.

TeeVee talking heads have explained there were plenty of comings and goings of helicopters in the area. They were used to hearing them.

[BladeLWS]

That and depending on which way the winds were blowing they could of approached with speed and been practically overhead with little to no noise.