ASA new obstruction

[DaveASA/FED]

ASA rules 12U R1 on first, fly ball to Right field, runner leads off ball caught and R1 heads back to 1st, fielder throws to 1st. F3 is standing in front of the base to catch the ball, contact was made prior to F3 having possession of the ball. I call dead ball, obstruction runner is back on first. Defensive coach says "she had room to slide in without hitting her." He is correct, she was standing with her legs slightly apart and if the girls would have made a perfect slide she could have gotten her leg to the base if she stretched. Anyway this brings up my question. Is it OBS any time that contact is made prior to the fielder having possession of the ball? My thought is yes. So if the fielder even had a foot in front of the bag, leaving 6" of bag exposed if the runner slides into the foot and contact is made prior to the fielder having possession of the ball I would have OBS runner safe. What do you all think?