Not entirely sure what you're trying to point out but let me rephrase. Apologies to the OP for jacking the photograph.
Arrows point to the dark spots I mentioned.
The groups of lines indicate the growth rings, which suggest to me that the grain runs parallel to the tool head rather than perpendicular (indicated by the arrow at the eye). The point is, if (IF) the grain is oriented in the way I am describing, and the wood had been cut in such a way that run out resulted, that run out would cause a break from the left to the right or right to left as you hold the tool in hand to swing it. This handle is broken front to back / back to front as you hold the tool. Note also that you aren't seeing the banding of end grain up and down the length of the handle, which further indicates that run out is not significant in this particular handle. Yes there is some, but again, it's running the opposite direction of the break. But it's all tough to see exactly. More pics might help.
image_zpsueiluzaz2 by
city_ofthe_south, on Flickr