Exactly- it’s best to understand any animals basic motivation and work with it. Roos are great and serve a definite purpose (or more than one).
Unless he's coming at you feet first, his behavior sounds normal. He's running towards you to check on his hen, claim her and get her back in line. "Get thee behind me, woman!" This is not usually aggressive although he is trying to claim ownership of your hen. If you put down the hen, he should dance around her with a wing dropped and mostly ignore you or put himself between you and the hen. Try holding the hen firmly about the wings with both hands so she is calm and hold her toward him - in his face. He should back off. He should be OK with you picking up hens around him; once he trusts you not to hurt them or steal them, and he respects your personal space most of the time, he will react less to your picking them up.