In the late medieval period, it was common practice for knights and commoners alike to hunt for ransoms during skirmishes and battles. When a knight was knocked on the ground in battle, his opponent given the opportunity would sit on him, disarm him and open his visor. An exchange of names would take place and the terms of his ransom would be discussed. I think this would be a fun and immersive element to make an appearance in the game, scripted or free form.