It’s true that the OA would be from the original square, hence total cover would not matter. Same idea as if someone moved away from you into fog, the fog doesn’t affect the OA if they weren’t in it when they started movement.
however thst belies the point as someone noted above. The initial 5 ft burrow down doesn’t generate the OA to begin with, as you haven’t left reach. It’s only on the second piece of 5 foot movement (going further underground or away from the person) that would generate the OA, and at that point you would have total cover.
however thst belies the point as someone noted above. The initial 5 ft burrow down doesn’t generate the OA to begin with, as you haven’t left reach. It’s only on the second piece of 5 foot movement (going further underground or away from the person) that would generate the OA, and at that point you would have total cover.