I've stalled a Shadow although it's very difficult.
On my checkride,the instructor demonstrated a stall and sure enough it didn't break away, just sat there sinking at high alpha with about 35kt on the clock. I then tried it and the same thing happened, so I tried it again pulling back quickly from low speed and getting the nose really high; it broke away but very reluctantly. Probably wouldn't do it solo; I weighed about 13.5 stone and the instructor was about the same.
I'm certain you couldn't stall it inadvertantly.