Festival Scorchling

Festival Scorchlings are level 1 fire elementals found near Flame Wardens in various locations in Azeroth during the Midsummer Fire Festival. They end the quest.

Event
Upon completion of quest the following occurs:


 * say
 * emote
 * say
 * It starts growing in size.
 * say
 * say
 * emote
 * say
 * say
 * At this point for a split second he becomes Wisp of Ragnaros.
 * say
 * He quickly loses strength becoming once again a tiny scorchling.
 * emote
 * say

Therefore it's almost safe to assume those are actually servants or spies of Ragnaros. The whole sequence is very similar to what happens when a warlock completes the quest (Impsy enrages and begins to pyroblast his master Niby but before he can complete the cast his power abandons him).