Hello.
For some days I've been downloading a large torrent slowly because only one peer was seeding to me at a very slow speed (10kb/s average).
Today, a new peer appeared so my client started seeding him all of what I've downloaded so far, but I noticed that his download speed was much higher that what I was seeding to him, wich means he's downloading from peers I don't have. How could this happen? I'm pretty sure he uses the same trackers as me.