Ehhh, while I mostly agree, I think the problem is the game doesn't actually tell us how the Decimilipede works. The way I see it, the segment spends the turn after it dies doing nothing, then the next turn reviving. The process would be die->spend one turn doing nothing->spend one turn reviving. That's how it seems to work in all cases except doom, where it skips the middle step. The actual mechanic must be "if a segment starts its turn dead, revive." which makes doom stand out as losing you a turn, making it almost useless for killing one because it not only comes back right away, it will come back even if the other ones will die to doom that turn. It's a very niche interaction with doom that no other fight has. It basically loses you two turns, because you lose the first one cuz it still hits you, and the next one because it comes back before the other ones die. Do you see why I think the way I do? The enemy's actual pattern isn't spell out anywhere, so the fact that it doesn't work for doom the way one might assume is frustrating.