There there, Mr. Penguin.
I'll be honest, I was going to skip this topic since there wasn't any d/l links for the Tankentai, and I really didn't want to waste my time on Google looking for it, and your code
when 19 # Regen... is completely useless to me (imagine if I told you to change
state.slip_damage to
state.slip_extension and left it at that, would you come back and ask me what line/script that's from?)
But I'm in a good mood

Should become
And that will fix the Tankentai so it works properly.
The other problem is your note in the state's notebox, it should read:
CODE
<slip: "hp", 0, -10>
If you want I can upload the demo I'm using if more problems arise