Lina and Ursa head down to rosh at the 2 minute mark, Lina stands on top of the edge and confuses Roshan so he can't move or attack, Ursa easily attacks him and kills Roshan in 1 minute.
This was a tda game, I was just strolling down the Tda website and these 2 players unfortunately got banned for this. Pretty neat trick tbh, only works if you're on Scourge however
here's replay
Just watch the first 3-4 minutes.