Relatively new here, though been lurking a little bit. Short background is I'm a GM running a small campaign while catching up on 4th ED rules, last time I played was 2 ED so I'm a bit out of date and have been trying to clarify a bunch of things, which a lot of you have helped me tremendously with already, so thanks.

Anyway, my immediate specific issue is one I can see coming up in the near future. It has to do with spirits on remote service, specifically attached to another player. Say Mage A attaches spirit to Street Sammy B to run remotely while Mage A goes to the stuffer shack. The specific remote service doesn't really matter, I don't think, let's say 'counterspell anything thrown at him'.
Street Sam B proceeds with his plan to hit the local arcology, and passes a ward he knows nada about. Spirit hits ward and obviously can't pass. What occurs from here? Does the spirit push its way through the ward to continue completing its task, report back to the mage with tears in its eyes, or perhaps just fizzle?
(I did do a search, but didn't find anything regarding this, so if there's already a discussion in the backlog somewhere please just point the way.)