Well, the plot thickens. It's hard to see how a civil suit issued in the U.S. can have any force here but that's for a judge (or nine of them) to decide. The only thing for sure that happened in that firefight is that a grenade was thrown that killed and injured two American soldiers and Omar Khadr was the sole survivor from inside the compound. Proving Khadr was guilty of murder in a combat zone will be devilishly hard to prove as his "confession" is probably worthless in a court of law.