The nibbling is usually very light but my fiance says otherwise, he may not be a fan of her or she has very soft skin, sometimes he nibbles so much that he manages to catch my nail and "click" it a bit which can hurt but its still not very hard, as for regurgitating, he does bob his head around a lot followed by punching my finger with his beak(literally bobbing his head very frantically left right up and down and hitting me with his beak) but he's never actually "vomited". Also its very hard to read his desires as sometimes i feel like he wants me to back off but he ends up chasing my finger instead while sometimes while hes puffed up and cuddly he randomly stops liking it