That looks suspiciously like a remote detonation via binoculars, where the viewing angle made the bad guys think the vehicles were right on the charge. Unfortunately, a lot of the time other troops aren't quite so lucky.
It does look like there is something on the surface, but to heave stuff up like that, I suspect a lot of the charge would have to be buried.
Certainly very lucky, but the trouble is, they have to do that kind of mission pretty much every day.
Chock