I barely play Spirit. (She's Level 11 ATM)
But... Her power states you cannot see Survivors, but you can see their scratch marks..
So my question is.. if you use an Aura reading perk on Spirit.. would you see Auras while using her power?
No, you don't see their aura's; they don't exist on the spirit plane at all, only in the entity's realm.
You can see survivors moving grass or corn while phase walking, but you cannot see auras except for gens. Any survivor that reads your aura while you phase walk will see the aura of the husk instead.