Oh no! Sis, I'll save you from the angry monster that demonstrably is capable of knocking buildings down!
--a child that has been bedridden for all of their short life, has no combat skills, and can barely hold themselves upright. Much less carry a weapon.
Kid then proceeds to grab her as hard as he can and not move... A maneuver that only serves to put his sister in MORE danger, as it further restricts her already limited options.
If they don't say something to the kid about what he did, I'm gonna be mad. Holding people still in the face of an incoming weapon is what you do to your enemies, not the sister you love the most in the world.
Desperate, panicked flailing because you want to do something but have no idea what will help is how you get your friends killed.