While the trainees were given free rein to their training regime as long as they completed what was needed, Jin continued to work on the third portal that the trainees were supposed to enter subsequently.
It took some time for him to adjust mainly because there were warplanes involved in it and to not make things too difficult for them, he merely put Spitfires Fighter Planes as the primary 'monsters' compared to other futuristic jets that he could have made. This was because he was using quantity to train the trainees compared to quality.
It was highly likely that the trainees would be overwhelmed considering this would be the first time that they would encounter such a 'metal monster' that could wield explosive fire. "Ah right, I did not teach them defensive magic... Ehhhhhhhh" Jin suddenly scratched his head and wondered if the trainees needed any last minute defensive mechanism placed in them to make sure that they did not die.