What I hear is this; the aircraft had completed its landing run at Charleroi and was making a 180º turn on the runway in order to backtrack. Whoever was driving it either misjudged the turn (or perhaps had a nosewheel steering failure) with the result that the outside mainwheels came off the hard surface, plopped gracefully into the soft grass and bogged in.
Whilst this could possibly not be seen as an upward career move it is merely an embarrassment and certainly not a life-threatening near-disaster.
Such taxiing incidents are surprisingly common. In fact, I seem to recall a cahp in Britannia doing something very similar with a 767 at LGW not long ago.