Idea:
All players, riding or running or in any way moving, have a chance to trip. This chance could be increased by things like going uphill or downhill. Or even something like blocking or holding an attack while running (i.e. paying less attention to your feet). I think this would be cool, and perhaps give some motivation for players to wear lighter armour (to get up faster(?)) and not run while blocking all the time. Indirectly this would likely buff archers, but it would also help infantry chase archers down if they had a random chance to fall briefly. It would also help hoplites by encouraging their opponents to down block only when they need to, and not just use it as an impenetrable anti-spear shield.
/midday thoughts
EDIT: This would of course be a very very small chance, and only one to really consider when doing very dangerous things (like backing up while blocking).
