Hi Master Cecil, Good evening. These are additional information. The sketch I gave earlier was drawn from a top view and the picture was taken at ground level facing outward from the main gate. Below is a sketch drawn from a side view. If we see it strictly horizontally, those rooftop corners won't directly hit the main door/bedrooms since those corners are on the same level with our rooftop base (ceilings). Our gate height is lower than our ceiling. But I do not know if this information has any relevance in poison arrow threats identification. Also Master Cecil, please advice if the corner post of our neighbor number 4 (pls see the picture taken) can be considered a real poison arrow. Please advice what to do. Any methods are highly appreciated. Side View: Thank you very much.