I came up with that rule after stabbing a downed opponent with a 2000-year-old metal blade was part of a Nazi dagger only to discover that it heals whoever it pierces. We later deduced that it was the blade from the Holy Lance. After the session I also realized that using it at all is a bad idea (due to space-time and probablity issues), and must only be used in situation where the person MUST be magically healed (i.e. a PC/crucial NPC is on the verge of death or just past it).
Also, someone please expain what you all mean by catgirls in a gaming context (besides the obvious)?