I agree with Tarlynxeno's proceedure of detecting for might with forceless casting.
I might have a character spont something along the lines of
Confirm the beast that is spyed
In Im 4
Range sight, duration inst, target ind
detects whether target is an animal
base 1 +3 range
If the spell does not work the most likely option (yet not the only option) is that the target has might. If you can get an In An total of 20 together you could pull this off with no fatiguing.
this will work at sight range and it will not, scare mundanes or piss off any heartbeast form bjornaer who might be targeted with it in the same way that a PoF might.
Eriks way is probably the best yes.. nevermind the Bjoernaer example, it might also be a faerie creature of some kind.. .. lots of potential to break the code if you just mindlessly chuck fire at everything ^^
It could also be a familiar.. or a shapechanged dragon