[Magic] Loophole in the “Tickle” spell

[Fred Brackin]

Originally Posted by 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),.

It doesn't say that. It only says (requires concentration) in the duration section
Concentration and Maintenance is defined on p.238 of Characters or p.10 of Magic.