I agree most hoods offer some protection but the 16-35? really its he most useless hood out there and it takes. heap of space+1000 on that one. It's the most annoying thing to pack. Period. At least it's cheap. My 400 5.6's built-in hood took not one, but two impacts with concrete and cost over $400 to replace each time. And now I have a carbon fiber hood on my 300mm 2.8 IS II that costs $400, not to mention the $125 lens cap. The $150 deductible on my insurance isn't so bad considering the cost of our hobby.
As for the OP, that sucks, but hopefully it will work out okay and you'll just be out the filter. The threads look a bit damaged, too, but hopefully it's just cosmetic.