helicrazi
the profile flown gives you a safe landing area before oei before tdp, you drift down to where you started, oei after tdp you have sifficient height to transition and clear the roof
And this takes more than twice as long, exposing the aircraft to a kind of "tail rotor avoid curve". I cringe every time I see this type of departure thinking "I hope that tail rotor doesn't let go, why is it taking so long"...