[Leec]

Sorry, I don't mean he has overall bad technique. When he's riffing he looks pretty comfortable. But whenever there is fast picking involved, it all seems to be done from the forearm.
That said, I don't claim to have a great understanding of his playing. I only have 2 albums of theirs and that's the first time I've seen them live, and I had an awful view. \m/

Another thing to check is how he headbangs, his stance. He's kind of odd. He stands with his feet quite close together and seems to move his head back quite violently, then brings it back to "neutral", and repeats. Not particularly important, but I noticed it and thought it was quite amusing.