[@Lucius Cypher]
They are on the main road to the keeps gate. It is a bit too dark to make any details out, what with the sun settling down and the smoke dimming things further, but by the time you'd get to the harpoon throwing range there would have been a change in the scene that would probably tell for sure whether they are friend or foe. It would seem that they are carrying some sort of a weapon on their belt, but it is on their obscured side, considering your viewpoint.