Konahrik

if you see, it's cost is 3% of mana, even if doubled (6%) consuming 72K is too much cause 6% of 300K is 18K, not 72K :\

Another bug that's present from 4 month until now is that Fell Flames spell in Destro Warlock specialization consume the double of the required mana it should use 36K mana, it actually use 72K, sometimes, very rare case, 102K (even if it should use only 3% of the total mana, as a cost) that's the spell link in gamepedia (cause wowhead removed it from WoD introdution) http://wow.gamepedia.com/Fel_Flame