Why wouldn't you just, like, spell-o-tape the wand to your hand? That's the first thing I would do before a fight.
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Nintendo came up with a solution so long ago
And no one in this magical world invented a magical way to attach the wand?
Remember Syriuses mother portrait?
Probably the same, but painful.
I always wonder what effect would the spell "Expellidentum" have.
Maybe a rubber band...
TBF, to combat Kedavra with a disarmer requires such a strong Expelliarmus that he might as well have returned a killing cirse
Imagine that hit someone directly, probably would have ripped the whole arm off.
Expelliarmus isn't a second year spell. They were taught it in second year in order to "prepare them" since, ya know, Voldemort had been to the school the previous year.