One of my normal female's escaped her enclosure about 6 months ago and was missing for about 2 months. We finally found her roaming around outside! But anyways the reason why i mention this is because when we found her she was obviously very cold and dehydrated (but she had a full stomach haha) but more importantly she was wobbling her head a lot just like the spiders do! I was really worried and didn't know how well she'd recover but after a few months it slowy got better and better and now she doesnt really show any sign of it. I just thought i'd mention it because it looked a lot like the spider wobble so perhaps the first spider went through some kind of situation like this, causing him to have a head wobble. who knows...just my random guess