Originally Posted by
Bendraesar
But who defines feeling a hostile force as unnatural? The example NPC is a guard, not a merchant. A guard in most cases has to deal with hostile criminals, monsters, etc., putting their life on the line to deal with threats to the city they're guarding. So they'd be pretty used to feeling hostile intent, mystical or otherwise, this sudden feeling is nothing new. (Now if you want to say the guard has lead an easy career... this is just a DM purposely trying to screw the caster).