I've been playing a lot of this mode with some friends since it came out in the rotation, and I have discovered that the Sunbreaker Titan super ability does not work properly in the game mode. Since throwing hammers is considered an ability, it requires kills to recharge. So if you miss, you can't throw another hammer since you will have no way of charging the ability. Unfortunately, even getting a kill doesn't work as it doesn't provide enough energy to charge the ability back up, and you're still stuck in the situation of waiting for your super to expire, since you can't use it to attack more than once.