I was sitting in the first row. My stop was the next one, the bus would be there in literally a minute.
This old man gets on and he instantly ask me if I could gave him my seat up. He was very polite, so I had no problem in doing this. When I stood up I saw a seat immediately behind me. 
If I knew this before, WIBTA if I asked him to sit behind me instead of making me get up?