There's some interesting discussion on pprune (a forum with a lot of commercial pilot regulars) here: https://www.pprune.org/rotorheads/606426-helicopter-down-

There's some interesting discussion on pprune (a forum with a lot of commercial pilot regulars) here: https://www.pprune.org/rotorheads/606426-helicopter-down-east-river-nyc.html https://www.pprune.org/rotorheads/606426-helicopter-down-eas...