vids up on my youtube channel.
Thoughts:
Fish Summons are 36f total, 41f for ground laser fish. Slidehead hits in 27f. Difference of 14f between Ground Laser Fish and Sildehead, or 9f for other versions of fish. If we say you have poor reactions, like 15ish frames. (Is that poor?) Potemkin would need to whiff something like a f.S or 2S and that'd be a free fish with time to jump a slidehead. But at the distance you tend to fight Potemkin, he'd never use these moves. So I think you are playing the fight from too far away. There, I just used frame data to figure out how to footsie the fight. I think that was suppose to be part two of my frame data guide.
Other side of the matchup, blocking a far IceSpike is a free Slidehead.