if in a golden age game if the earthshock hand is with in the field of the structural integrity field object would that stop it from being destroyed?

and no where can i see in the power if it still is effect if the character no longer is adjacent to the fist?

SIF will protect the Fist.

It's in effect for as long as the Fist isn't destroyed and/or Geo-Force isn't KO'd.

However, if you don't destroy the Fist and it reattaches and you then KO Geo-Force, the Fist's effects stay active.

And courtesy newbie prod: please quote the powers in question but since you're only 2 posts in, you're off the hook