Heres the thing, there would be no point in saying ANYTHING at all about this if it went like this..... Cast spell(incurring enmity)-->Spell is done(not incurring enmity)-->Recover MP/HP right after you cast the spell. I hardly think thats going to be the case, why say anything at all if it was like that. The only time your going to be "incurring enmity" will be when the spell was caste, going from your words. That means you just have to sit in one spot and will ALWAYS GAIN HP/MP and never stop, unless your casting something. EVEN THEN you don't get enmity when your casting something, so there for the only time hp/mp will stop regaining will be the one second that your spell hits. I'm just going off your logic here bud..... To be honest, its pretty broke if its going to work like that.