Does tip affect this?

[Rock'nRef]

Player A1 goes up for a 3 point jumpshot. Defensive player B1 goes up with A1 and gets a slight piece of the ball on the block attempt. A1's shot hits the rim and bounces over (behind) the backboard. I know that without the tip it is B's ball but does B1's tip affect this? Whose ball for throw-in?

Thanks for your help!

Rock'n Ref