[AtlUmpSteve]

I have the same ruling in ASA as NFHS casebook play. Cite ASA 8.2-E(6).

Batter-runner isn't doing "what she is supposed to do". Under cited NFHS and ASA rules, the BR must avoid interfering with the catcher making the play on the dropped third strike.

The NCAA rule 12-2c heads in the same direction, and then adds a note not used in ASA or NFHS; "If both player' actions are appropriate to the situation and contact could not be avoided, it is inadvertant contact and not interference or obstruction."

Personally, I believe that defining one or the other as having the right of way (as defining this as interference) means contact must be avoided to not interfere. But, the NCAA version allows the BR to believe she can run without regard to interference, so long as the contact appears not intentional.