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Your friend states, "When a reaction reaches dynamic equilibrium, everything stops."
Why is your friend incorrect?
There are reactants and products still present, so the reactants are still working to form products by proceeding in the forward reaction.
The concentrations of reactants and products must be equal since the rates of the forward and reverse reactions are equal.
The reactants must completely disappear for the reaction to stop, which means it should be proceeding in the forward direction.
The concentration of reactants and products remain constant since the rates of the forward and reverse reactions are equal.