OBR 709(a) Dropped third strike, hinders catcher?

[LionsCoach]

I'm new to site. I had looked at prior postings concerning OBR 709(a) but still slightly confused.

Specifically, 709 reads "It is interference by a batter or a runner when- (a) After a third srike he hinders the catcher in his attempt to field the ball;"

I know that some rules spell out the interference must be intentional and some include accidental interference. 709(a) just says "hinders the catcher". There is no reference to intentional. What is the correct ruling apply 709(a) to the situation that happened in our game yesterday.

Situation:

Dropped third strike which rolled into fair teritory (location of ball probably not relevant). Batter upon running to 1st. steps on ball rolling it away from catcher. Catcher was unable to make play due to ball being stepped on and moved.