I am deeply troubled after speaking with a Muslim

I was speaking to a Muslim coworker about Orthodoxy and I don’t know what it was but I felt very uneasy during and after. It did not make me question my faith or anything like that but I just got a knot in my chest during the conversation and I felt like i just needed to get away from him as soon as possible. I don’t know why? I work with this guy everyday I have lots of conversations with him but when he was talking about the Quran and staring me in the eyes I just felt this dark presence and I felt like I needed to move. What does this mean?