[Magic] Loophole in the “Tickle” spell

[Varyon]

My interpretation of this situation, assuming it is indeed the case that Tickle requires Concentration for the seizure to continue (and ceases whenever the caster isn't using Concentration to keep it going), would be that an intermittent seizure (so you suffer a seizure for a few seconds, then can act normally, then suffer a seizure for a few seconds, etc) simply counts as a single Seizure, and the FP cost is assessed at the end. That way you can't just alternate on-off for a full minute and wind up dealing 30d FP to the target - you cause 1d FP, regardless of how long the seizure lasts, whether it is just one continuous minute of seizing or something that happens a second at a time. If you want the FP cost to scale with how long the character is actually seizing, divide the number of seconds the character actually spent in a seizure by 60, then multiply the 1d result by this value (round up) to determine the actual FP loss.