Ball Enters From Below

[CJRef]

Rule 9-4.....or cause it to enter and pass through the basket from below. If A1 shoots and B1 gets a pretty good hand on it after it's released and ends up entering from below, who gets the ball after the violation? B1 is the last to touch, but is it a judgment call if the touch caused it to enter from below? I kicked it tonight pretty bad, and want to make sure I get it right in the future, although I can't say I've seen the ball enter from below too many times.