How does 469 not violate <R19>?

[Travis Hoffman]

Originally Posted by EricH

Now, come up with a design that will not get a penalty, and will block 469 while somebody else is defending, and we'll talk.

Any robot could do this, provided a robot can get into position on a bump to block where the ball hits when it exits from 469's deflector.

Not clearly seeing from the video how 469 uses the bumps to deflect balls, the bumps are not part of the end zones - they are part of the middle zone (The Arena, section 6.2.3), so one robot defender would be free to defend one goal while another was on the bump to block the other direction. The robot on the bump would have to take care not to touch 469's end zone when climbing up there or would coordinate with its partner to get on the bump first before the partner entered the end zone to defend the other goal.

Am I missing something here?