I think 9:22 is the time the two worlds sync but your question about fisher is really good and i shall compliment your theories with even more theories when fisher thought he was going to kill spencer in the bunker he said "do you know what happens when someone dies in between both worlds" which makes me assume it's a call back to when they said before that fisher "erased people from history" which makes me wonder if it's that how Spence's Dad died and spencer forgot about when did his dad die because he was erased or does being erased literally means being erased from ever existing so by erasing himself fisher killed spencer as well?