They should make some instanced quests that require you to learn some of the mechanics related to raiding, that can't be completed without using said mechanics like spell interrupting.
Maybe call it "Raider 101", and have characters take on one of the roles in a scripted fight with NPC's against a fake boss that can only be completed by that character playing his role properly during various phases of the fight.
Maybe call it "Raider 101", and have characters take on one of the roles in a scripted fight with NPC's against a fake boss that can only be completed by that character playing his role properly during various phases of the fight.