First time I have seen this in all my years of moose hunting.
I have heard of grizzly's enjoying a hunters kill before, but a cat? Usually they are pretty timid. This was a fairly young cat, and initially it ran off when I first approached it. As soon as I turned my back though, it was right back on it.
What can you do? You can't shoot it. Yelling at it didn't seem to help once he was back on it.
I finally scared it of by yelling and waving my arms, as I approached it. Brave suckers..
I managed a picture of it that I'll post later.