Not sure if this is a bug... I just started trying to locate things outside of the realm of what the help file says.. As time goes on, and if I get bored, I'll try to exploit the spell even more to try to locate things we're not supposed to.
The below results come from a c "elemental attunement" blood
You cast your arms wide, sending forth a searching sphere of elemental magic. A large thaumaturgic circle in A Heavily Warded Chamber