It seems to me that this mechanic works only for cases where the ball is knocked OOB and the question is who knocked it out.
For the case of a player stepping on the line, only the lead has the angle to see that. There is no way that a trail official will be able to reliably tell whether the player stepped on the line or not. I've had an occassional partner try to do that (perhaps having heard that mechanic from somewhere) and have been wrong far more times than they were right.
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