He swung his right arm upward to shake Harry's hand, but at the last moment seemed unable to face it, and merely closed his fist and began swinging it backward and forward like a metronome.

他伸出右臂靠近哈利的手，但是最后一刻似乎有些畏缩，然后合上拳头前后挥了两下，像个节拍器一样。