User blog comment:V3hemenc3/Support Champ idea: Isonade the Water Priestess/@comment-153.25.111.60-20110929110844/@comment-4434162-20110929141442

...you mean her W? i designed it to be able to be used in teamfights. The shield, when procced with the Shark Skin passive gives her increased armor and magic resist, reducing damage dealt to the ally. if the teamfight is over or if the ally gets away, then you can activate it again to heal the ally.