Obvious solution is that book of moon resolves first destroying Spirit reaper then ring resolves the target has been removed from the field so the effect fizzles. But one of the judges said that the spirit reaper would go...face down and avoid being ring'd.
Incidentally, what the judges said there was the correct resolution of the chain. When "Book of Moon" is used on a face-up "Spirit Reaper," that "Spirit Reaper" will be flipped face-down before its destruction effect would apply. The fact that it's face-down also keeps it from being destroyed by "Ring of Destruction," which needs a face-up target.
Of course, the fact that it took them so long to resolve such a simple matter makes me think that they aren't the most competent of judges.
Also of note is that your judges were
definitely handling illegal activations wrong.
If a card is illegally activated (example: Trap Cards when Jinzo is on the field, Raigek with no monsters on the opponent's side of the field, etc.), that card is placed face-down (if it was set on the field) or returned to your hand (if played from your hand). That is the best and most correct way of handling illegal activations; forcing the player to send their illegally activated card(s) to the graveyard is punishing them for sloppy play by making them lose cards they should
not have been allowed to activate in the first place. This is a negative (and incorrect) method of dealing with those types of situations. A simple warning should be assigned for the player not being careful enough to realize that they were making an illegal activation, and end it at that.
Two people have already posted since I started writing this, and they've likely covered everything I just did, but I've already typed this up so I might as well not let it go to waste.
