Is Finite Incantatum like a closing HTML tag? Does it shut off all the spells on someone that can be shut off with that, does it shut off the first one, does it shut off the last one, does it do something completely different?

It would be interesting for someone to put a spell on someone, if it works by shutting off the last one, then put another, and another, and another -- a layered nest of active spells so that it would take a lot of Finite Incantatum to actually close off the spell that's meant to stay, concealed.