I thought I had some other slab cut photo's from another job, but I can't find them at the moment.
I must have deleted them
The white powder is from the cutting process when they are using the water for heat/lubrication.
The picture is at least a day later after everything has dried out. This process is very messy
and water is all over the place. I don't think they used as much water as with the process
in the photo's I've taken.
As far as reinforcing, I believe there is some in there. If you look in the far cuts. there are symmetrical dots
about every hole (right-side). Would most likely be wire mesh. Also, in looking at the wall, it's composition
is that of brick so this building is most likely pretty darn old. We don't There could be a wall right behind the
camera.
Working out in the field, if you have to cut a slab opening and only have a core drill, you are going to use it.
Time is money and to wait a day to get a wetsaw can cause delays.
I agree that M-dubs shadows are possible given that my beam has that same shadow.
The one that throws it off is where the green line points. Either the camera position is very high,
or something from above is casting another shadow. The other thought, it maybe this originally was
just 4 holes and someone expanded it to make it rectangular.
Either way, it is still funny. Real or edited