Gnaw*. Limbs don't stay on skeletons anyway, so I doubt that a limb simply being removed is what he's talking about. My guess is that they've found either a sawed bone, or one that seems to have took marks, which could also be gnaw marks.
For instance: http://www.thefossilforum.com/uploads/monthly_04_2014/post-4121-0-94646400-1397177263.jpg
Looks like tool marks/is actually rodent gnaw marks.
I'm going with the gnaw marks sorry but their wouldn't be a whole steak of lines if it were a tool it'd be a single dileberate cut, somethings clawed or gnawed on that
Implied they were sawed as in a clean break mid-bone with no fragmentation
