There's no specific place he needs to fall, He just falls rapidly and he has a chance of appearing in my side, doesn't matter where he falls, anywhere he falls might make him appear where I am, if Hale falls slowly It won't happen, but it happend 2 times today, Hale kept falling, next time I'll try to show a demo of him doing it, I'll have to wait till map gets on again, probably tomorrow will happen or today who knows.
Edit: It'd be great if you can change to it and force me to hale