I recently got hired as an editorial middle-manager at a small publishing house. It's my first-ever job that's actually related to my interests, and I'm loving it. At the same time, a guy was hired as a part-time employee who would basically do the same tasks I'm doing, but for just two weeks. I scored higher than he did on the selection tests, so I got the permanent job and he got the temporary one.
On our third day I had already finished my first assignment with impeccable speed, and was already underway my next one, and he asked me for some advice on how to complete his, which was roughly the same size and difficulty as my first one. I showed him step by step how I summarized important parts, how I chose the relevant lines of result tables, and so on. He was quite impressed by my methods.
Next thing I know on the next day, he had quit because he didn't feel comfortable with the job.
Did I intimidate him? I admit I wasn't exactly humble when I showed him that I was a more capable editor, but was it wrong to let him know by how much?