Quote Originally Posted by xanderh View Post
Either way is a valid interpretation of the RAW. It really depends on how strong the DM of the game wants that ability to be. I've tried it both ways, and I prefer to play it the way you proposed.
It'd make the most sense to me as well. You're hitting them with the same energy that made it harder for them to resist the spell in the first place. Logically, it would follow it would make it harder for them to shake the effects if you keep re-applying that 'debuff'.