you shouldn't trip off this. He didn't see you copy the article from his site, and he can prove you sent the article blast from AMR. If you did something behind a closed door, and you were the only one that knew what you did, how can someone prove you did something if they weren't there. If he does take action, play it cool. Deny everything and tell him to prove it. Maybe someones trying to set you up, who knows, as far as he knows, you have haters. Feed some BS.
Also, wipe your internet history. Not just cookies, but more like things in the index.dat file. That way, they cant trace what you did by taking your computers memory. I made the mistake of not clearing any memory on my drive. It was used in court, but they couldn't prove i did what they were trying to get me for.