Mandarin as a second language

Today at work I had a group of Koreans who did not speak English. One of them spoke Mandarin and so I was able to speak to her and she communicated with the rest of the group what I was saying. I speak a lot of Mandarin everyday to so many Chinese people who sometimes have varying degrees of ability in English, and sometimes can't speak any English so my Mandarin is useful, but this was different. It clicked in my mind that I was participating in 2 people using Mandarin as a second language to communicate. It gave a whole new meaning to my experience here.