Dent stayed put, but when Miles alerted about the footfalls, he turned to face north. Won't do for Thaliss to get flanked. Dent readied himself to be attacked; his shield rose to a defensive position, and his new longsword was held at the level, ready to inflict pain.
OOC:
Move: None.
Action: Ready an action. If unfriendlies are detected, Dent will attack (probably with the longsword, but possibly with a bonus action spell...not sure until we cross that bridge)