What is the meaning of drills in this paragraph,
The colleague looks very happy, as people do when they have not been working for a sufficient stretch of time as sales assistants. “Hi, how can I help you?” Ove drills his police-flashlight finger into the counter. “I want a computer!” The colleague no longer looks quite as happy. He gives the first sales assistant an insinuating glance as if to say he’ll pay him back for this.
From A MAN CALLED OVE by Fredrik Backman