What do you mean you have to switch first? It works the same as her regular skill, but instead of going back to damage she stays a healer.
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He's trying to say that if he does the switch, he only gets the 40% healing increase for the initial 10s of healing, then the rest of the healing doesnt get that healing increased. same when she reverts back to attacking and only gets 10s of 40% bonus atk. which is a bit of a pity.