Very very odd.
Being involved in emergency services, I beat the living hell out of my devices. I use an OtterBox Defender. It has dropped from the drop of a Engine. Ladder/Roof. It has gotten very very damp in side my gear and it still works. Looks mint when I take it out, besides a few dust bunnies. So 10 stairs I would not think this would happen...
Again... My device is put through more then what any one would do. and it holds up.. Yes I have gotten replacement skins, as they do stretch after some time. But phone is intact in the case.
Oh here is Otterbox Legal mumbo jumbo if you needed it.
OtterBox Limited Warranty
Otter Products, LLC and its affiliated companies worldwide (“OtterBox”) warrants our OtterBox products against defects in material or workmanship for a period of one year from the original date of purchase of the product by a consumer (the “Warranty Period”). OtterBox does not warrant, and is not responsible for, any smart phone or other device made by anyone other than OtterBox. If a material or workmanship defect arises with regard to any OtterBox product, and a valid claim is received within the Warranty Period, OtterBox will (i) repair the OtterBox product using new or refurbished parts or (ii) replace the OtterBox product with a new or refurbished OtterBox product. For purposes of this limited warranty, “refurbished” means a product or part that has been substantially returned to its original specifications. In the event of a defect, these are your exclusive remedies.
Exclusions and Limitations
Except for the limited warranty expressly set forth above or to the extent restricted or prohibited by applicable law, OtterBox expressly disclaims any and all other warranties express or implied, including any warranty of quality, merchantability, or fitness for a particular purpose, and you specifically agree that OtterBox shall not be liable for any special, incidental, indirect, punitive, or consequential damages for breach of any warranty of any type on this product. In addition to and without limiting the generality of the foregoing disclaimers, the limited warranty does not, under any circumstances, cover the replacement or cost of any electronic device or personal property inside or outside of the product.