Reduces damage taken by the target of your Intervene ability by X% for 6 sec.
Safeguard extends the effect of Intervene. After you intercept their next attack, this leaves a residual damage reduction on them for six seconds.
The usefullness is entirely dependent on how often you use Intervene. As far as builds go, this has a similiar feel to Improved Spell Reflection- situational, but could be quite powerful in those situations.
Not part of standard tank builds.
Can be used effectively by an off-tank to take some of the heat off the main tank.