I have a question of cricket that I have been asking around and I have been getting mixed answers. My question is around a situation.

If a batsman hits the ball high up in the air just over the pitch, and the bowler thinking that he can catch it leaps backward with his body stretched backwards. The way the bowler leaps backwards, is bound to be a fall on the stumps on his back. He catches the ball whilst on the air and assuming that the bowler might hurt himself (by falling on the stumps) the non-stricker pushes the bowler (who is in the air still) and the bowler falls safely on the ground with the ball still in his hand. Who is out? The batsman or the non-stricker.