This is a known issue. The total recovery for Geiger’s S is 10 frames, but 2 of those frames occur while Gieger is walking. From when Geiger stops walking to recovery is indeed 8 frames. I haven’t tested it, but I believe if you are mashing during geiger’s walk animation, you can start a move during the intermediate 2 frames as well.
Ah I see, I wasn’t aware the opponent could act during the super animation. I was able to get a hit in with DeGrey, but I can’t hit with B from Valerie so it seems to still be off by a frame in that case.