"Please follow it."
"Understood." With a hand still on the footprint, the Mercury Maid melted from the hands and flowed downward onto the ground.
This kind of statistical analysis and pattern recognition was exactly where Trimmau was strongest. While following footprints was a sort of old fashioned method of investigation, the fact I had so cleanly overlooked it meant it might have been a blind spot for the culprit as well. For magi that were often wrapped up in more supernatural matters, the very concept of examining the ground they had been walking on was, plainly put, outside their field of view.
"Gray, come with me."
Having returned to its original shape as Volumen Hydrargyrum, Gray and I had to start running to pursue Trimmau as she slipped through the thick foliage.
Case Files II, Chapter 3, Part 4