Tail rotor failures
Mod: Not intended to blame pilots, quite the contrary, so mod you may remove my speculation.
I know from personal experience that the Motorflug guys are good in tail rotor failure training.
Tail rotor failures require quite some aero dynamic performance of the tail fin, depending on the settings of tail rotor power. It appears to me in the Cabri design that the effective surface is (in relative terms) smaller than say R44, B206. So we could have a sudden stall of the tail fin, combined with low inertia, that make the maneuver quite a bit more tricky.
m2c
d3