According to Watcher's frame of mind they are not right. They should be reworked as he said in interviews for similar situations. For the time being they should remove them from the loot table of fire mage.
Alternatively, they believe it's unfair to remove them because someone may get something better instead of them while those that got them will feel cheated.
A rework might be best to be imminent. The class in whole doesn't need (additional) casting while running. Perhaps it's hard to find an effect that is right.