Quote Originally Posted by daveimi View Post
People build flippers, so others made invert-able robots...

finding other ways to stop a spinner blade...
These are two different things, invert-able robot don't stop flippers flipping, they just mitigate the prime effect of the flip itself.
Stopping the disk itself would require a great amount of absorbed energy. Spinners can also be deflected, just look at some of the fights between last rites and sewer snake on ye old interwebz.