This setup is one that should be used when you are either inexperienced or with a random group.
Quite simply you take every available Defender passive other than the Shield Bash/Rush ones. This gives you every possible defensive Tank benefit.
You need to use Reverse Stab along with the Tactician passive to reduce the cooldowns on your Sword abilities. You do this by activating your Defender’s Resolve which has a really long cooldown. Then use Shield Bash as and when it’s needed. Once both of those abilities are on cooldown you Reverse Stab an enemy and it reduces the cooldowns on those skills making them available again much sooner.
The Shield Bash ability is used because in random groups you will struggle to taunt everything and keep it locked on you mostly due to your teammates poor positioning so you benefit greatly from an additional taunt and stun. Finally you use Defender’s Resolve with the addons because this will give you an area of effect taunt combined with damage reduction and a heal.
You should be regularly using Light and Heavy attacks to benefit from the Refreshing Move perk on your Sword. This will reduce your weapon ability cooldowns which is essential but it also help you to maintain your threat on the enemies with the constant damage output. Not only that but by dropping block to do these attacks you’ll also have a sustain benefit with your Stamina, allowing you to perform more dodges and blocks.
The Swordmaster passives you choose aren’t that important they are just needed to unlock the next level to get to Reverse Stab and Tactician, since they increase your damage with the Sword it will help increase your threat and maintain the aggro of enemies.