>grooves are supposedly the marks of the comb that she deflected the rock with

It's commonly supposed so, but I think not, the stone with the grooves is actually said to have landed about a mile to the NW.

I know where it is, but I'm not telling. I know what you're saying about the odd angle of that erratic, but that's a tale for a different thread, on a different day, after a fair bit of investigation which hasn't happened yet.