Ec-120B Colibri simulated autorotation

what we did in school sucked...
http://www.youtube.com/results?search_query=colibri autorotation&search=Search
proper ones here

the engine stays connected to the rotor
this helicopter doesn't have a cluth
usually there is a little skid, but this time it was a small one

Wow, was that in autorotation? He didn't even have to skid, that's a by the book autorotation.
BTW, how fast can the engine be reconnected to the rotor, should a student mess up and let the rpm drop?