Not facing the opponent

[bainsey]

A-1 goes airborne. Defender B-2 has his spot in the lane, but facing in another direction (turned about a 90 degrees from the path of the shooter). Instinctively, the defender jumps, and has clear verticality, but is not facing the shooter when contact is made (shooter's torso into defender's side). This was an easy blocking foul, as the defender wasn't facing the shooter at all.

Generally speaking, and outside of an outstretched limb from the shooter, when would you have a charge -- or nothing -- when contact occurs, and the defender isn't facing the dribbler/shooter?