jah and a few others were fighting in the corner of the jewelry store (opposite the green spawn point) and you somehow sniped somebody inside from the pizza rooftop, in a position that is not possible, which means you were using some type of wall hack. It's not like you just simply stood on one side of a wall and shot through it, you shot through the wall from a great distance.
Also, after I banned you several players told me they were sniped in that room as well. Denied.
