Traveling: The thrower must establish a pivot at the appropriate spot on the field and keep all or part of the pivot in contact with that spot until the throw is released. Failure to do so is a travel and results in a stoppage of play and a check .
Results in a stoppage of play and a check only if the travel is called.
Exceptions:
If a non-standing player loses contact with the pivot spot in order to stand up, it is not a travel, provided the new pivot is established at the same location.
It is not a travel if a player catches the disc and releases a pass before the third ground contact (XV.C).