I'm not surprised that is the result if you have given him no training.
A properly run command course should contain no traps or hand grenades, everything you do you will have been doing previously from the RHS so it is more a case of practice than teaching. As I have said many times before, it is the mental transition from RHS to LHS that is usually the stumbling block and that may only come out during line training.
As Oblaaspop says, you can help to open up a persons mind, getting them thinking in the right direction, thinking like a captain, (which they should have been doing for the previous months anyway), but you cannot teach the human qualities that make a good commander/manager, you can only develop them.
In the military we were always taught that if you want to be promoted to the next rank up then you must behave like the next rank up.