1) Shield bash vs Low blow. Should I utilize both or use one over the other? What are the pros and cons to both?

2) Silence. What's the point of this skill if I can just use Shield bash/low blow to counter an enemy skill? I must be missing something here.

3) what is the recommended defensive cooldown rotation? I usually start with rampart because it lasts longer which allows me to focus on dps. Once that's done I pop Sentinel then Bulwark when that runs out and finally anticipation. I throw convalecence when I'm around 50%hp to help out the healers and awareness every chance I get.

Any advice would be greatly appreciated!