A patrol of three Zhentarim sent from Castle Krag has been overdue for several hours.
The next patrol would find the remnant of three burned corpses along the road, not even a mile from Castle Krag, over which a single Zhentarim cloak on a pole is streaming in the cold mountain wind.
If the patrol has a somewhat able tracker, they could see three pairs of tracks leading from the site. Two humanoids wearing boots or shoes, and one bigger pair.... a good tracker might recognize it as a troll.
While there is no trace of who exactly did this, it might serve as a reminder that the power of the Zhentilar ends outside the limits of their towns and fortifications.