[Andrew Hackard]

If one monster in a fight is immune to fire/flame attacks, no fire/flame attacks count in that fight. You don't allocate specific "damage" to specific monsters so this is the easiest way to handle it.

Unless an ability says something different ("draw a monster and add it to the fight," for instance), the card you pull from the discards goes into your hand. Apply the usual rules for when cards may legally be played.