What kind of physical and military background does the teacher give to Moses?

Les explains that Moses was not some puny little individual. He suggests Moses was probably one of their head generals, had fought quite a few wars, and was a man's man. The account says Moses looked this way and that way to make sure no one would see, saw no man, and slew the Egyptian. With one blow, he put the Egyptian in the sand; it was that easy for him. Then, realizing what he had done, he hid or buried the Egyptian in the sand. This military toughness and physical strength are what the teacher highlights about Moses in this passage.