Experience
I don't think that you quite understood the purpose Lushmoke, I believe that this idea is intended to try and persuade people who run intentionally to not run. Although I don't think that it would be a successful addition to the Toribash game rules because sometimes, especially in mods with low gravity, you hit or are by the other person and the momentum causes one of you to go flying off. Plus this would lead to tc farming unless was small and then it would not be much of an incentive.
Leg-grab as a noob move? You must be foolish. So what do you think is the most 'pro' way to play? Both guys hold both hands and then wrestle, right? THAT is totally not pro (many big dan players do that, especially on duels tho). So that's one basic and boring way to play actually.