Thanks for this thread. I've corrected a few folks who got serious misinformation.
Here's one of the worst.. "If you pull out your firearm, you better use it". (wrong on so many levels!)
Although serving in the military "could be" great experience they don't teach Maryland or civilian self-defense law. (at least not while I was in).
If your instructor said it exactly like that verbatim, then I agree it’s wrong. However, the statement “If you pull out your firearm, you better be prepared to use it”. Is more appropriate. In my opinion that means that the situation was one of immediate threat of serious harm. If the attacker ceases his attack then put it back when the threat is gone. However, things can escalate real fast once the firearm is out of the holster.