Can be used as an effective way of preventing an objective's death to stall time so allies can contest the objective more effectively
Leaving the zone early may be beneficial if it provides a guaranteed escape route
Do not use if the overall outcome will be negative. Saving an ally's life isn't worth saving 3 enemy lives at the same time
Perfect setup for large area of effect abilities from allies that can quickly clean up heavily wounded enemies
Use on allies farther away from enemies, so long as the circle extends to the desired ally Kindred wishes to save, this will further ensure it'll become very difficult for enemies to save themselves by hopping inside the circle
Has infinite value, and as such will require much practice to get a feel for the best use in every situation