Welcome home from your hospital stay. How's the amnesia???

I saw your previous post, no biggie. Jokes aside.....
Like most accidents, multiple factors are involved in order for it to happen. A mech in ATL who had been through a few scream sessions due to this issue told me that there were quite a few hints before it happened. The brakes on 706 had recently been replaced, hence no pressure in the accumulators. The Thrust Lever quadrant had been removed and replaced, hence the thrusts levers (or lever) being in the take off position for easier access to the screws. Let's not forget that the steering linkage was also disconnected and that the mechanic responsible never sat down in either seat. She simply stood in between both seats and hit the start button. As the engine lit off, she was only along for the ride as she was thrown into the back of the cabin.
Aircraft 975 had just been pulled in front of 706 for work. After light off, 706 ricocheted off of 975 and dragged it into the hanger. A portion of the left wing of 975 was torn off by the air-stair door of 706 (which was also torn off), with the winglet of 975 being thrown into the left engine of 706 and FODDING it out. Had it not, 706 would have probably gone straight into the hanger, severing the left wing off on the hanger door frame and more than likely exploding.
Aircraft 916 was pushed into the back corner of the hanger just prior to all of this, also. The tug and tow bar were still connected. This, along with the tremendous drag of having 975's left wing on top of 706's left wing (or 706's left wing jammed under 975's left wing if you wish) stopped 706 from going out the back wall of the hanger. The tug alone (706 was on top of it) probably saved the mx crew inside of the aft equipment bay or avionics bay (wherever they were).