Razzle Dazzle! It’s me, the Razz-Dazzler!

a few weeks before the incident with stan and ford in actual canon (while fiddleford was still there) stanley was invited by ford to be another test subject for the portal test. he was at first reluctant because he had to be part of something he didn't understand whatsoever, but ended up driving to ford's lab anyhow so he could just see ford again. dummy was still wrapped to his wrist, and like fiddleford in gf canon, he was pulled in for a short moment, with ford yanking him out and fiddleford watching. after being told what he already knows (that he doesn't understand, he's not smart, etc.) by a manipulated twin brother he was yelled at to leave, but came across the memory gun and the blueprints in the process of exiting the lab. maybe a little peace of mind wouldn't be so bad. just a little peace of mind

stan would steal the memory gun, run away from the lab, and disappear. until he's found as an old, tired, unrecognizable amnesiac many years later

by this time, and though he never saw what stan saw in there, fiddleford knew the portal was dangerous. he travelled to hide ford's journals away from him when he wasn't watching until he was caught in the portal room taking the first journal to hide it. lots of shoving, arguing, lever flicking and yelling about ford's twin brother later, fiddleford broke and told ford "he was the one with a sickness". one last hefty push from ford had fidds slowly lift into the air and get sucked into the portal before ford's eyes. fidds would brew over his concern and anger towards ford in the 30 years it took to get back