CHECK OUT your differences in wand technique here and how fluidly and casually Ron throws a curse in comparison to Harry and Hermione.
Hermione has done the reading and is technically perfect of course Elbow straight; wrist bent, wand tip aligned with left sightline, left arm held loosely behind her for balance.
Harry hasn’t ever done the reading. Grip too tight; elbow locked, shoulders raised, left elbow cranked in awkwardly against his body. Kids’ll imitate his awful technique and it’ll make their parents nuts; “don’t twist your neck like that. I don’t care what Auror Potter does. When you save wizardkind you can hold your wand however you want until then drop your shoulders!”
Ron’s been around wand users since birth and practised with twigs and then his brothers’ wands. Look at how the movement flows from his center; the way he uses his whole body – throws out his opposite hand behind him to counterbalance the movement. Harry and Hermione get their wands into position and then throw the curse; Ron’s spell starts mid-motion because he knows his wand will be in position in time. (helenish)