question about the corner-block rule

[Eria4044]

<G21> ROBOT incursion into the Corner Goal - Incidental incursion into the corner goal that occurs as the result of a ROBOT pushing balls into the goal is permitted, not to exceed a distance of approximately 3 inches. Intentional incursion, for example to use a ball gathering mechanism to drop off balls inside the goal, or extending a portion of the ROBOT through the goal opening to activate the ball counting system, will result in disqualification of the offending ROBOT.

That was all I could find in the manual about corner goal interference, but last I heard defensive robots had to keep 3 feet away from the corner goals. Maybe it has something to do with pinning (G24), which could conceivably trigger the ball counter inside the corner goal.

Here's the manual for you to see yourself: http://www2.usfirst.org/2006comp/Manual/4-The_Game.pdf