Scrum in lane, control gained with two knees on the ground...

[Camron Rust]

Originally Posted by Rob1968

Cameron, all statements in Rule 4 are based on the general principle that the game is played by players in a standing or erect position. 4-44-5 a, b deal with a player whose posture changes from that attitude.

Not really. Rule 4-44, the traveling rule, doesn't assume that. It explicitly covers a player holding the ball while on the floor.

Originally Posted by Rob1968

In some instances, one may lean to the general principle that "if it isn't illegal, it must be legal." And in other instances, one may adhere to the general principle that "if it isn't legal, it must be illegal."

Without a case or a rule saying it is legal, it must be illegal in the case of traveling since it, unlike other rules, lists the legal options and prescribes all the rest to be traveling.

Case plays, in general and specifically in this area, are not listing all the cases that are traveling. They're just describing some of the examples of what is traveling.