Yes, its odd. Light magic becomes repeatable if you continually try to recast it for about 20 presses of the select button, I assume its sort of a bug that coincides with the first cast wearing off. Either way, once it happens you can just keep pressing select to recast light over and over and over without having to wait for the refresh time.
For those of you who didnt know about it, its a neat trick to get your magic stat up to 999 so you can pretty much walk up to anything in the game (including Seath) and burn him down with one cast of Orladin magic.
Well done Tom.