Weak RoF with a kick. Spam this along with guardian or reversal and you'll have melee guys running back for healing. One of the few reasonable spammables for healing ritualists IMO.
I always liked making tanks work for their healing (i.e. vig. spirit and healing seed). This fits right in that mold-- encourage them to tank properly, and they'll be rewarded by vengeful's healing
You've also got to remember that this steals however much health from the enemy, so its like reversal, but with damage to the attacker. thats why i use it.