Rules Analysis
If the turnover location is in the offence's defending end zone, the thrower may choose where to establish the pivot:
at the nearest point on the goal line to the turnover location, by moving from the turnover location.
Immediate movement, failure to move, or signaling the goal line option determines where to establish the pivot and cannot be reversed.
If the thrower breaches rule 13.11.3, this should be treated as a travel infraction. Play does not stop, but the thrower must return to the correct pivot. The thrower cannot pick up the disc, look and see if there are any players to pass to, and then move to the goal line.