Yeah, I get told I'm strange all of the time so I'm not sure my input would be at all helpful. I feel stupid but I don't even understand what you mean by vertical or horizontal lines. I mean I know what they are, but in relationship to this I'm not really understanding what's going on.
I think I figured it out, thanks. I just have to cut it parallel with the flash, which on these slabs is the hardest possible way I had to cut this one at 120˚, or 45ish depending on where you start. I had to hold it on its side. It was awkward.