Excuse me for my ignorance but how does putting them on my block list prevent anything other than communication?
As to whether or not it was a combat log, the ship was flying forward on a straight path for about 45 seconds, weapons fire wasn't doing any damage. I actually can't remember if a wake was left or not.
That does not sound like a Combat log, FWIW. If the ship is visible, the client is still running, so the other player has not combat logged. A combat log would have the ship vanish immediately. They may even have just done escape/quit and save which has the ship hanging around for 15 seconds (not 45). No weapon damage could be anything from you being too far away to them hacking the client to give extra shields, and various things in between.