The True Range of Fire Demon

Explosion casts 42 times in a minute with a fast (4) staff. I don't know how fast Fire Demon casts, but it would have to be faster than 84 to be 'faster' than Explosion.

http://www.southperry.net/forums/showthread.php?t=3217
Fire Demon takes 720 milliseconds to cast.
Explosion takes 1500 milliseconds to cast with a fast (4) weapon.

720 x 2 = 1440ms < 1500ms

Two fire demons casts faster than one explosion. And you have even have 60 milliseconds to turn around to cast in both directions

Besides, if you want to compare casting fire demon in both directions vs explosion, it would be something like this (approximately).

 Spoiler