I'm sorry but I'm with Gliff on this one. Safeguard while tanking is absolutely fantastic. The ability to keep a near-constant damage reduction on your co-tank as well as being able to get some tasty vengeance. Add to the that the odds that this could very well keep your riposte rolling, especially if you're not getting hit by the boss at that time. Vigiliance has it's place, but it's very limited to fights if you are really min/maxing here.