Black didn't answer for a moment. 'I had a little trouble with him. I was late with my work, and he came and asked me to repeat some tests we had done a month ago. He was always annoying me about that and I was impatient. I used some strong language and - and told him to get lost.
'You told him to get lost?'
The young man's face reddened. 'I was just annoyed with him. I didn't really want him to lose himself.'
'I realize that,' Dr Calvin said. 'You may leave, Mr Black. Thank you for your assistance.'