l do not believe it is, l think it must hit a bump in the wall or a twig on the floor

l do not believe it either and i've yet to see one

If you hit a ''kill'' shot exactly in the crevice between the floor and the front wall, it will dribble out as a ''roller.'' It is rare but a ball hit hard and exactly in that spot will roll

Yes, a roller in handball is physically possible. As you hit the ball and it meets at the point where the wall and floor meets [ l think] It will hit the wall and no air below it will allow it to bounce. Thus, it will come out rolling.

it is physically possible but will require alot of luck and perhaps skills. I've hit a couple myself.

l agree its not