Geros didn't move as Kiara left the room, he was more of a general after all. Besides his own personal retinue and the army of frankly pathetic imps that worked as a mobile intelligence network there weren't many of his demons in the general area, something to rectify while the wall still held.

The garrison was surprised as Geros's forces surged onto the battlements but living in a land of warlocks had a way of bending perceptions. Soon enough the barrage of combines arrows and magic regained its momentum, bolstered by an entire platoon of greater demons. 

Cackling silently to themselves the imps crept through the fields behind the siege lines, despite being weak compared even to a human there was always a certain strategic advantage to conjuring hell-fire, and what was a siege with no encampment.