Measured with the real brain on the seeded pocket: it pressed GO ROUTE
first, while the gym's door was still the second tier's answer. That
refusal wrote the door to the blocked ledger and also withheld GO ROUTE
on the tile, so the next deal -- the last resort, whose walk now goes
where it can -- was never made, and the fly waited out the window.
Only a last resort deals goals the ledger is already resting, so the
refusal worth remembering where the fly stands is the one that taught
the ledger nothing new. A refusal that writes a new exclusion changes
the next deal by itself.