I wonder if the bolt was installed slightly off angle. They might have been hurrying to get the last few in, and they were operating the drilling rig on a fairly steep slope towards the bottom of the spillway.
Something to watch for certain.
I guess you more-or-less answered my post before I sent it. :)
This one was emplaced in the middle of the drilling repair process.
The extra mortar on the spillway may have been from excessive pressurized mortar "back ejection" from a second attempt at an angled re-drill. If there are any "drill experts" out there, chime in... this may be part of why the image was pulled from the gallery (i.e. revealed a bit more to the situation).