from the rule book ...
2.8 Reversal
A reversal occurs when the defensive wrestler comes from the bottom/defensive position and gains control of the opponent, either on the mat or in a rear-standing position. For the purpose of awarding reversal points at the end of the wrestling area, points shall be awarded when control is established while any part of either wrestler remains in bounds. (See Illustration Nos. 57 and 58.)
[My note: the aforementioned illustrations deal exclusively with edge of the circle determinations, which were not a issue in the Gingrich - Marsden match.]
From the Wrestling Interpretations section of the rule book:
RULE 2
Definitions
Rule 2.8 Reversal
SITUATION: Wrestler A, who is the defensive wrestler, stands up and does a standing switch and subsequently grabs Wrestler B's leg up and off the mat in a single-leg position. QUESTION: WHat is the referee's call? RULING: At this point, no change is made. Wrestler B continues to receive riding time, and no points are awarded. Wrestler A can release Wrestler B's leg and receive one point for an escape, or Wrestler A may retain the single leg and attempt to earn two point for a reversal by putting Wrestler B on the mat. A single-leg position is not enough control to justify a reversal. An escape cannot be awarded because Wrestler A could put Wrestler B to the mat for two more points for a total of a three-point move. If the period ends or both wrestlers go out of bounds while Wrestler A has Wrestler B's leg up, the referee should award a one-point escape because Wrestler B lost control.
Tom