Encounter number 2 Worship in The Twisting Halls adventure - part of the Red Box set contains Kobold Tunnelers (minions) with the following ability:
Narrow Escape At-Will Immediate Interrupt
Trigger: A close or an area attack hits or misses the Kobold
Effect: The Kobold rolls a saving throw. If it succeeds it shifts 3 squares.
Three cases came up, and for a new 4e DM, I felt uncertain of the correct rules - given that this is the red-box adventure, it'd be good to teach all new DMs the correct way to think about these things.
- Magic Missile - as per other questions here, does not "Hit" so any Kobold minion on the other end of that spell is dead. No saving throw. Right?
- Surprise - The party had a surprise round on two of the Kobolds, so I ruled that the interrupt didn't happen. With combat advantage, two more dead monsters. I'm not sure if this is right. Does surprise negate triggered effects? If not, the next sub-question applies:
- I had no problem dealing with a attack missing, save == shift 3. The thing that had me unsure was when a party member hits (which would auto-kill the minion), and the kobold makes his saving throw in order to shift - does the hit fail (which spares the Kobold) or cancel the damage (which, would kill? a minion?)