On page 108 of Street Magic, the Power Pact quality, it allows the character to use one of the spirit's powers. What it doesn't specifically say is the strength of the power when wielded by the character. Is this power treated at the same level as the spirit's Force, or is it linked to an attribute on the character, such as Magic?
I would like to know if there is an errata or anything that specifies this? Short of that, I would certainly entertain house rules and their justifications.