In patch 5.4, We have added a new mechanism -- 'The Crowd Chose You!!!' in arena. We added it for two reasons: 1. We don't want the fight to last too long; 2. We want to ensure one team to be the winner in each fight. However, we don't want players to change their playstyle due to this mechanism. Unfortunately, we are not happy with it after this mechanism was added.
So, we decided to change it in a different way. In the upcoming hotfix, we will completely remove 'The Crowd Chose You!!!' and replace it with a new mechanism called 'Suppression'. If a fight lasts longer than 10 minutes, all player in the arena will get a stacking debuff -- healing reduced by 1% every 10 seconds. This effect will last till one team wins the fight. Under extreme circumstances where the winner cannot be decided within 20 minutes, the system will end the fight and randomly decide the winner.
We think this change will have less effect on playstyle, team composition and strategy than 'The Crowd Chose You!!!', and make the fight more interesting and excited. We are doing an internal testing now, and will update it when it is released.