David and Alan arrive at James of the Glen's house. What is happening there? What is the cause of this?

When Alan and David reached the house, they were greeted by James Stewart of the Glens. Alan asked him to speak in English so David could understand. James immediately mentioned how bad of a day it had been. The murder would certainly be pinned on the people of Appin. Alan asked him to consider that the Red Fox was dead as well. But James exclaimed that he had a family and it would be better for him if Campbell were still alive.

During this conversation, the confused scurrying behind them continued. James explained that they were burying the weapons and burning dangerous documents.