I think that there is a big difference between starting from a "closed" surface or deck (like concrete, for example) or a net.....
On a closed surface, you can hover in ground effect-and use that factor when taking off.
On a net, you are hovering in OGE.
When fully loaded, it can happen that the heli-when coming OGE while reaching the border of the platform-can come into a dive.
This is a really dangerous situation-the tail can hit the deck, or the tail rotor can get into a stall because of the different wind situations, which can result in an uncontrolable turn.