My thought is that this is not an uprising but an opportunistic moment; people who had been abused by Sorn went and got payback.
But that does leave the mystery of the dead body.
And I can see Rowenna, once she thinks of it, or learns just enough about Scyld, will think that he may be guilty and in a bit of twisted loyalty will become protective of him, causing some fun misunderstandings and otherwise inexplicable actions and words.
We really need to do some follow-up on that dead body.