Be Patient, then Dash! - GOLD
Hello all, thanks for your constructive and well-reasoned responses and discussion this week. Before I get to our solution, I have one matter of business to attend to; When this scenario was initially posted, it was lacking credit to the judge who inspired it. That credit goes to Sebastian Pekala. My apologies, Sebastian!
Now, on to the solution. Nin, while she noticed an infraction but didn't call immediate attention to it, has not committed any infraction herself because players are NEVER obligated to point out their opponent's missed triggers. Therefore she is within her right to notice the error and wait to call a judge later. She is gaining an advantage through paying more attention to the game than her opponent and knowing very well how the rules apply to the situation, both of which are legal and encouraged.
Art is guilty of GPE-Missed Trigger, and because the dash ability's delayed trigger is generally detrimental, he will be awarded a warning. Because this is a delayed trigger that changes the zones of an object, it doesn't expire, and will be resolved either the next time a player would get priority or at the start of the next phase, whichever Nin chooses.
Thanks for your contributions this week, and check back soon for our next scenario!