If your AP is below 40, you don't get healed, by anything. You should know that, man!

As a side note though, this particular system seems to be more trouble than it's worth. I would love it if it was removed (not AP altogether, but just the no healing for <40 AP). Like you said Dusty, this is the main reason why adding warping in houses would be so difficult. It just seems like a flawed concept altogether. That if you pk even on a semi-regular basis, you can't heal. If you fight the giant blob, you lose all your AP (yes, you could hit it once and then just stand on the sidelines, but that's no fun). I don't think AP is a flawed system altogether, but the healing penalty is too harsh. It's also frustrating that when farming gralats in swamptown, for example. Having to find a blob to kill me so I don't lose my bombs (where I would normally go to my house and heal myself via heart vases).

I think there should be a different penalty for low AP. I really don't know what, but the no healing thing just causes so many problems.