The way this build is intended to be played is by inflicting a range of AoE abilities and proc sets.
Before heading into combat you should buff up with Frost Cloak and using Netch. Throw your Caltrops in front of the enemy and move in while taunting the priority targets.
Place down Blockade, Gripping Shards, Scalding Rune, make sure you are blocking to activate your Frozen Watcher set. My preferred way of doing this is to do Skill > Light Attack > Block for 1s > Repeat.
Use Frozen Device to pull in any ranged enemies, and you can also apply Fetcher Infection to enemies, especially the priority targets such as Elite enemies and Bosses.
Main focusses are to maintain all debuffs, so refresh Block for Frozen Watch at least once every 3s and cast Caltrops and Scalding Rune on cooldown to maintain the main buffs and debuffs you are providing.