In addition to Narvals technical description: we used to practise an inadvertent reverser deployment inflight on occasion in the simulator. While it shook the aircraft quite well until the engine was shut down (if I remember correctly, this was one of the few engine failures where the aircraft would not indicate the affected engine by lighting up the fuel lever; identifying the side was done by looking for the retarded power lever and the little R on the engine display), it was still flyable without noticeable loss of altitude. An open TR is not an instant accident in this aircraft at all.