This is a very very good reason not to be too enthusiastic in conducting such training too close to the ground. My personal minimum is 300 ft AGL.
Pity the Darwin crew of the Beech 1900 didn't think of that when someone pulled back a throttle seconds after lift off and crashed with fatal consequences. Although I understand that a Citation operator in Queensland used to pull back an engine at V1 on the runway to test the student's reactions.
Overconfidence perhaps in his own ability to take control if mishandling occurs. If CASA is aware of this practice they haven't stopped it.