Rules Analysis
A turnover that transfers possession of the disc from one team to the other, and results in a stoppage of play, occurs when:
the thrower has not released the disc before the marker first starts to say the word "ten" in the stall count (a "stall-out");
the disc is intentionally transferred from one offensive player to another without ever being completely untouched by both players (a "hand-over");
the thrower intentionally deflects a pass to themselves off another player (a "deflection");
in attempting a pass, the thrower catches the disc after release prior to the disc being contacted by another player (a "double touch");
What:
The thrower accidentally releases the disc while pivoting, and then catches it again, without any other player touching the disc.
Result:
This is not a double touch turnover. The marker can continue the stall count. If the thrower has moved their pivot foot a travel infraction can be called.
Why:
A double touch turnover can only occur after the thrower has attempted a pass. A pass is defined (under Throw) as "A disc in flight following any throwing motion, including after a fake attempt and an intentionally dropped disc, that results in loss of contact between the thrower and the disc". As the disc was not in flight after a throwing motion or fake attempt, no pass has occurred and therefore 13.2.5 does not apply.
Extra:
If the disc is accidentally released during the throwing motion as part of a fake attempt, the thrower cannot catch the disc unless it has been touched by another player. The thrower may touch a disc they have thrown, for example to prevent an opponent from catching it, or to tap it to a teammate. If the thrower does catch their own pass, the turnover location is where the thrower is when they caught the pass.