How pathetic!
Pathetic right? But these things happens. Perhaps not in the same way but,once therr wasn't any pre-agreed sharing formula amongst gamblers, there would always be one person who would sort out means to cheat the other with some entitlement argument like we have in OP.
In the real sense, it's wrong of the account owner to seek a lion share in this as, it wasn't agreed upon, the risk was equaly shared and as much as they would have had to carry equal amount to a lose, same ideology should follow instances of profit.
I don't see a reason why i would go physical while gambling as my model for gambling is very simple although, I would hate to discover that I was being cheated on a good bet.
We need to be wise as a gambler especially if we are a street gambler because that is where this kind of things can easily happens. We need to know and understand the kind of cycle we are betting in some that it will give us the ideology to know how to react when things goes wrong or when the other gamblers want to cheat to have the largest share by taking the funds. It is not ethical for us to fight when we gamble so avoid violence that can lead to bigger problem that can be difficult to handle. It is better for us to use our intelligence to handle the matter than to fight back or be the first to start a fight.