I read this, and I figured out this is what I need so, how do I use it? I tried self.parent:GetController():UpperBodyState(THROWING_PREP) and self.parent:UpperBodyState(THROWING_PREP), but it just won't work.

Halp?

I believe those are internal to the AI coding, rather than intrinsic engine variables.

And that means?

either
self.parent.UpperBodyState = 6
or
ToAHuman(self.parent).UpperBodyState = 6
should work, exept if this is read only.

Nonono, I'm not trying to change it, I'm trying to see if the actor is charging to throw the grenade.

The AI Lua script uses those, and nothing else. The only way to determine its value is access it through hacky methods. I don't recall specifically how to do it, but I believe Kyred had a thread about it a while back.

Uh, I hate kacy workarounds.

I'll look into them.

You may be able to access it using the AHumans metatable.

And how would I do that?

And TLB, I found this, which lead me to this, but after reading it I suppose it's not possible, but I've got to test it.