I noticed that in Shadowrun there are a lot of security meassures against spells but only very few if any against spirits. For example there are mirrored windows or the condition that if you are astrally perceiving that you can only target dual natured targets with spells. While that does seem to provide some security against spells it seems to be useless against spirits. Assuming the mage knows the location of the target which he probably can easily find via astral projection he can just send a spirit to take a target out. A nonawakened person is pretty much helpless against a spirit and you can send them pretty much anywhere as a remote service. If you would not want it to do as a remote service, then you could just remain in the astral a few hundred meters from the crime scene. Furthermore it seems to me that the astral signature vanishes with the spirit. There might be one at the place of summoning but that could be pretty much anywhere and can be easily pushed into the background even before the attempt is started.
A magician using astral perception can “wipe clean” a temporary astral signature (such as from sorcery) or hasten its normal fading. A magician can spend a Com- plex Action to reduce the amount of time it takes for the signature to fade by 1 hour (mentally pushing the signature into the background energy, if you will). No test is required. This action can be done multiple times until the astral signature is gone. If the signature is not completely erased, it will be obvious to others assensing it that someone tampered with it. (p.312)
Is there anyway to find the summoner if there isn't an awakened witness that assensed the spirit to get the astral signature of the summoner?
EDIT: This question is aimed at two things primarily:
- Precautions that you can do that would make this approach harder, similair to one way windows against spells.
- Ways to find the summoner after the target has been killed since it shouldn't take longer then 6 seconds after which the spirit is gone.
I hope this makes it clearer.