I was watching some of my LL girls play in the All Star trnmt. and the first baseman stepped down the baseline toward the runner. She did not have the ball. She blocked the runner from the base. Then, the ball arrived and the runner had never touched the base. "Out!" The first base coach immediately started yelling for "interference." What he meant was "obstruction." The defense had obstructed. The runner had not interfered.
Well, maybe. much of LL is based upon baseball rules and terminology.