May be worth if nothing else is around and scholar is in attunemt, or to get your combo ready or mantain your stacks on it. But even then if you are really about to kill it, scholar can just sacrifice it and get 3 stacks and the heal%+.... So..only very few times it may be worth it, but a stun or silence would do it too without wasting dps on it, if you really wanna stop that fairy for some seconds...