Neighbor's roof shingle cracked my window...

Last night it was extremely windy in my area and a roof shingle from the neighbors roof flew off and shattered the window on my building. I took pictures and have the actual 4 ft piece that flew off. It is obvious which piece flew off when you look at the roof.

I plan to ask the property manager next door to pay for my window. My question is what happens if he refuses? Do I just have to eat the cost? My insurance deductible is higher than the cost to replace window. Any advice is appreciated, thanks in advance!