Dolohov and Bellatrix had been the only two quick enough to see what was happening, to cast protective spells before they went plunging into the icy water, but the rest weren’t so lucky. Crabbe and Goyle were struggling, waving their arms helplessly in the frigid ice, but when the girl turned towards them, they went silent—it was as though some enormous, invisible hand had simply pressed them beneath the water, and was holding them there. 