yeah,I wish Mashima would go into more detail on how magic works in this series, though - then this sort of thing might not seem so random.
That's what it is. I knew something really bothered me about the format of FT, but couldn't figure out what. No real rules. 1st of all when you have magic, the rules are kind of iffy in the 1st place but to do a manga centered around many types and ways of doing magic, then you really need to weave the rules throughout, not just explaining after or even during a fight.