Not a troll. It was the shine off his car windshield. If you look at the second pic you can see the shine on the gutter between the domers from when I asked him to move his car.
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No, it was from the window on the dormer. Look at the angle of the shadows in your two pics. The window has a slightly concave surface, creating a focused âbeamâ like a magnifying glass. The reflection also has a parallelogram shape from the sunlight hitting the rectangular window at a high angle. By the time you arrived, the sunlight had moved over the house and the window was now in the shade.
Windshields are convex, and create more diffused reflections. Otherwise, thereâd be a lot more late afternoon and early morning car wrecks from the reflections of oncoming cars literally blinding drivers 
(Oh, and I bet the reflection on the gutters is actually from his headlight or possibly a chrome grille)
The reason I went into this lengthy explanation, is because someday youâre going to have an equally ignorant customer try and blame you for melting their siding, when it was actually due to a nearby low-e window with the concave-magnifying-mirror issue.
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You guys are actually analyzing a window reflection?
BTW many house windows are not flat, thatâs why you get a focused line instead of a squareâŚor whatever.
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It was his vehicle windshield. Look at the 2nd pick I posted. The glare move to the gutter as we moved the vehicle.
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Cleaned a white metal roof last week and noticed the folks standing in the middle of the yard looking hard at the roofâŚi thought we done good and theyâre admiring their new looking roof. So I pridefully asked, âhowâs it look?â, the wife looks to the husband and he saysâŚâwe are seeing a lot of areas that are green and splotchyâ. I almost fell over, I went to where they were standing and sawâŚ
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Showed them it was the reflection of the sky and green trees!
Iâm not a smart man, but I know how to clean a roofâŚ
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