Harry watched the plant die in horror. The hateful words seeped into his head and burned like acid. He felt suddenly quite afraid and very alone - he looked around to see if anyone would come to see what the shouting was about, but there was no one around.
He flinched as the stranger screamed and the rock exploded, bits of the red-hot debris showering him. He stumbled back, horrified. Run, said all the instincts he had formed over a lifetime of persecution from those bigger and stronger than himself. He forgot everything Ginny had said about going to her dad's. He took one more wide-eyed look at the raging madness in the stranger's face, and the wand-tip coming around to point at him, and ran for it.