[Chuck Kennedy]

Putt is not in. This is similar to the ruling for a disc that lands in water 803.03F. Once the disc has landed in a position based solely on the energy imparted by the thrower, the disc is considered at rest. Further movement from that location due to wind, gravity or water currents do not change the position. There are several examples like disc landing in water or this one with the disc on the basket rim where the disc is 'relatively at rest' (specific phrase not defined in the rules yet) where further movement doesn't change its position. Another example is a very windy day where the putt is caught securely in the chains but the chains and disc continue to move in the wind. The group allows the player to remove the disc and hole out even though the disc never stopped. It was "relatively at rest" in this case just like the disc floating in water or the disc in this video.

What it boils down to is the group has the power to say that a disc is 'at rest' once it appears the disc has gotten to the position on the target or the playing surface (which includes water) from the thrower's energy (perhaps waiting just a few seconds). Note that the target and playing surface are special exceptions (see Interference rule 803.07B) to a disc landing anywhere else above or below the playing surface. In those cases, the disc is marked once the player gets to the point above/below its location regardless whether it's moving or not.