Festival Scorchling

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

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 Trolls of a Feather (Impsy enrages and begins to pyroblast his master Niby but before he can complete the cast his power abandons him).