Parece que a magia é um encantamento (por exemplo, quando você diz isso, lança a mágica). Quando é lançado, ele simplesmente segue a linha da varinha, em vez de exigir qualquer movimento específico da varinha.
Harry ignored her. He had just found an incantation (Sectumsempra!) scrawled in a margin above the intriguing words ‘For Enemies’, and was itching to try it out, but thought it best not to in front of Hermione. Instead, he surreptitiously folded down the corner of the page.
Harry Potter and the Half-Blood Prince
e
‘SECTUMSEMPRA!’ bellowed Harry from the floor, waving his wand wildly.
Blood spurted from Malfoy’s face and chest as though he had been slashed with an invisible sword. He staggered backwards and collapsed on to the waterlogged floor with a great splash, his wand falling from his limp right hand.Harry Potter and the Half-Blood Prince
e
A few of them stumbled, one or two of them bound in ropes, but those climbing on to the rock behind them merely stepped over or on the fallen bodies. Still slashing at the air with his wand, Harry yelled, ‘Sectumsempra! SECTUMSEMPRA!’
Harry Potter and the Half-Blood Prince