Quote:16.1(b) How can a ruck form
Players are on their feet. At least one player must be in physical contact with an opponent. The ball must be on the ground. If the ball is off the ground for any reason, the ruck is not formed.
A ruck ends successfully when the ball leaves the ruck, or when the ball is on or over the goal line.
Quote:Law 16.7 (b)
Before the referee blows the whistle for a scrum, the referee allows a reasonable amount of time for the ball to emerge, especially if either team is moving forward. [neither were] If the ruck stops moving, or if the referee decides that the ball will probably not emerge within a reasonable time, the referee must order a scrum.