I did some research and theory testing with it last week and my conclusion came to what I can assume the devs intended on. It really is only for aetherflow stacks during moments where you will honestly and desperately need them. It is less of an emergency ability and more a preventative measure that requires a lot of forethought before using if you are, indeed, using it in regards to healing when you know an "Oh $!%#" moment may be approaching before it happens.