No problem.
Mugen: Actually, they don't have to be a seed to nail you. BT doesn't bother to mask anyone's IP address. Depending on the client you use (such as BitTornado), you can get a list of the IPs on the torrent that your client can currently see. This can be done by all users, even if you are just a leecher. All the lawyers have to do is get logs from the ISP that show who had that IP at that time. Of course, that may not actually be logged, it depends on the ISP, their software and their willingness to work with the corporate gestapo.