First thing, I wonder which knife was used for which cut. If their rabbits are like ours, then the legs will be pretty lightweight bones, the neck would be tougher. A chop through a leg bone could not be compared to cutting the head off due to the bone structure, thickness and variety of impact angles.

The edge from what I can make out does show a bit of a roll, however comparing the knife in the review to the stock photo from the junk yard site shows quite a difference in edge grinds.. Wonder if he re profiled the knife to a finer edge to improve slicing without thinking about the other consequences.

Not sure what else....