Sorry, coming late to the thread.
Somebody asked for a quote to prove, that a spirit power can be sustained from another astral plane.
I can't give that, but page 293 SR4A gives us
" Also, line of sight does not have to be maintained after the power takes hold of its target. Critters
may sustain a number of powers equal to their Magic at one time."
under the heading "Duration", subheading "Sustained".
For me it's basically the same for most scenarios if the spirit materializes and uses Concealment on my team and then vanishes to his home plane or if it materializes, uses Concealment and then flies to another city or continent or hides somewhere.
In both cases the power runs and nobody on site can do something against the spirit sustaining the power, because it doesn't have to be there.
Somebody asked for a quote to prove, that a spirit power can be sustained from another astral plane.
I can't give that, but page 293 SR4A gives us
" Also, line of sight does not have to be maintained after the power takes hold of its target. Critters
may sustain a number of powers equal to their Magic at one time."
under the heading "Duration", subheading "Sustained".
For me it's basically the same for most scenarios if the spirit materializes and uses Concealment on my team and then vanishes to his home plane or if it materializes, uses Concealment and then flies to another city or continent or hides somewhere.
In both cases the power runs and nobody on site can do something against the spirit sustaining the power, because it doesn't have to be there.
Thank you. I pointed this out last page I think.