The werewolf saw that his opponent was waiting for him to make the first move, so he did.

Despite the fresh wound Siax had given him, Remus was able to ignore it for the most part, although it did have a slight effect on his attack. Instead of going for Siax himself, Remus went for that damned weapon of his, making sure not to aim for the sharp and pointy part. To the werewolf, it was nothing more than a part of Siax, so in his mind, removing said thing would not only help him bring this guy down, but would injure him as well.

No, werewolves aren't very smart.