The context of the following conversation is Robin tapped them on the shoulder after they had continued talking throughout the lecture for five minutes.:
Robin says I had to tap two people in my lecture today to ask them to quiet down..
The friend responds What were they doing?.
Robin responds They had been talking for five minutes while the professor was lecturing..
The friend responds That is really distracting..
Robin responds What did you say to them to get them to stop?.
The friend responds I just asked them to be quiet so I could hear what the lecturer was saying..