People showed some replays on world chat, where Tashi pushes heroes behind the screen or to the edge and they cannot come back.
Today it happend to me, he literaly kicked my Malrath from midle of the arena way behind the screen. When all my heroes died like 20s later he came back and was obliterated on the edge of the screen. Whole that time he had full ultimate and never used it.
P.S. He's also insanely OP at O (around 80-90lvl), literaly number 1 hero.