OH GOODIE OKAY SO stephen and yennefer will end up casting the spell and upon finding out that it only takes them so far, they're going to decide to focus instead on istredd alone. and, when they realize the limitations of the spell itself, they are going to go ahead and take the risk to use the thaumametors to enhance the tracking spell as best as they can, which will most likely involve doing it from the location istredd was taken, as well as once again using the sap to help increase its power. c: