Foul or Interference?
 

This is a case from the 2012 ASA (USA) Case Book

B1 hits a ground ball toward 1B. The batted ball comes in contact with B1 over fair territory, while advancing to 1B. The touching is (a) intentional, (b) accidental while the ball is over fair ground, or (c) accidental while the ball is over foul ground and before the ball has reached 1B.
RULING: In (a) and (b) it is interference and B1 is called out. In (c) it is a foul ball because contact is over foul ground. (1-INTERFERENCE; 8-2F)

My question is related to situation (c).

Suppose the ball was still spinning and had potential to come back fair AND the B1 contact was not accidental. B1 sees the ball in foul territory and bends down to pick it up, but the ball was still in motion.

Is this now just a foul ball or do we have interference because the ball was still live and the contact was intentional.

Thanks

foul ball for the reason noted

Thanks