Pure stupidity! All you need to do is F* that up, end up in a split S over speed, and or over stress the airframe. Then you could end up like that starcheck crew, or worse pull the wings off, or the worst case do unseen damage to the wings and some other poor sap looses the wings because of you overstressed the airframe and didn't say anything! Not implying any one here is responsible of this BTW.