Hi Thomas
nice animation,. with good humour ,. made me Laugh

good work on the dragon breath / flames,.
At one point ,. (crazy professor) the focus is lost,.
You can enable the depth of field in Carrara and then use the manual focus target picker in OR4C, to select the focal point in the scene, this will create a key-frame in the Carrara time-line,. and the focus will transition between keys.
AMD Athlon II X4 640 Quad core 3ghz.
12GB ram , 2TB HDD Win 7 pro 64bit
Nvidia Geforce GTX 650 Ti 2GB