Haven't explored the possibility of other places the headless horsemen visits and chucks fire on the town but i have for brill.
The step by step guide below will show you how to get onto the town roof and how to grief people attempting to put out the fires. Stop reading if you are not interested.
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After completing this you will catch peoples buckets if they are thrown close enough so try to stand on the fires (does 10 damage every 30 secs or something stupid). You will also want to throw the buckets away as they are unique and an extra bonus fires around you will be impossible to put out even if the water hits them or you fail to catch it.
Enjoy grieving.