Actually I did say I have had snakes bitten and scratched by rodents - myself first hand experience - yes I absolutely know how to properly feed my snakes - these things don't happen over night or by feeding too big or the wrong food item or from a hungry mouse - it takes but a split second for a panicked rat or mouse to grab onto your snake and do some damage.
Anyway - here is a mouser girl that I had get bitten - yes I was watching diligently when it happened - she grabbed the mouse - wrapped it and everything seemed to be fine - until she unwrapped to start eating and I noticed her bleeding - that was two years ago - you can still see the scar on her face - a little more to the left and she could well have lost an eye as it is she has a hard time shedding her head and whistles when she breaths.
http://jetpythons.com/IMG_5416.JPG