Shouldn't we let someone know we're doing the dangerous thing that has knocked us out before and we've been warned about? Even professional weightlifters have someone spotting them, if they have a brain in their head anyway.
Grandma may be a bit... miffed... at needing to be pulled away from Kohaku because her granddaughter decided to play with Cast From HP effects.
And I wonder if we can channel the power boost somehow... not to do more raw damage, but to give us a Requisite Secondary Power reinforcement, sufficient that using the power boost doesn't damage us anymore (even if the boost is nerfed in the process).