So, I have this mage in the group, that does the following thing that I believe is a loophole, but can't find anything on;
He overcasts spells, takes physical damage from the drain.
Then, he casts heal to heal his own physical damage and successfully resists the much lighter drain of that.
In effect, he is using most of his magic quite "drainless", is that a loophole, or don't I understand the rules?