You must be standing to begin observing for sigils.
Whorls of dust upon the ground catch your eye. You get closer to study them in more detail.
After much scrutiny you are certain a clarification sigil has revealed itself.
Roundtime: 4 sec.

Got that message every time I PERC SIGIL'd even though I found a primary and a secondary one. Not sure which part is the bug, the message or being able to find it while sitting.