FED - Three-Foot Running Lane

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8-4-1g: The batter runner is considered outside the running lane lines if either foot is outside either line.

8.4.1c: With R1 on third base, B2 hits a fair ground ball to F3 who
fields ball beyond first base. He throws to F2 attempting to retire R1. The throw hits B2 who is running on the foul line. RULING: B2 has not interfered, since he was running in the prescribed base path.

In our last training class of the year, several veteran umpires told real-life stories of this case play and that you call them out because "the lines are not part of the lane." The way I read the case play, the lines ARE part of the lane. When I countered their story with the case play, it was responded with "we'll just ask the state interpreter later this week."

So, what's your judgement in this play? Is it different in NCAA or OBR?