Her nose crinkled, instinctively.  She drew in a breath through it as a >>side effect.  She noticed the pungent odor as an arc of blue >>electricity shot from one side of the electric pilot to the other.  

The cause of the explosion was a bit unclear. If this gets explained >later on, more power to you. If it was a Freak Accident, it needs more >detail.

I took the blue sparks jumping around to mean it was a gas explosion.
Pungent odors usually equal something explosive (ie, propane, methane,
rotton eggs, etc)
Don't believe me, eh? Put a carton of chicken eggs on a general-purpose
heater for a month and toss ONE into the air. (Be sure to get the Hell
Out Of Dodge when the damned thing comes down...  and to be upwind.)
Also, never ever do such hazardous things inside. Room mates and parents
tend to turn slightly homicidial. Usually something like an average
episode of BGZ ;)
-- 
Thomas Hamill
thamill@psd.k12.co.us
"If pro is the opposite of con, then is congress the opposite 
of progress?" -unknown
"The difference between Living and Surviving is a 
Dream." -also unknown
"Saints have no moderation/nor do poet/just exuberance." -written on a
trash can in my school