There is a huge issue with people time locking other players in Arena by making their fights last nearly 5 min. Someone time locking can easily pay 1-2 reset and lock down the first arena places for 15min. Not only this makes a player untouchable but also prevent the other players he is challenging from progress on the ladder.
So a good solution to prevent people from playing the clock like this would be to add a player timeout during the arena fight. So if a player does not issue an order to his team for 10 seconds then his character loses his turn and the turn meter moves forward. So waiting 4 min before finishing an opponent and locking down the ladder is no more an option.