I am as anti-man biter as any one out there. The most important thing to do is to figure out why. For some it does not matter but for me I like to know why before I take action. If you have worked him for an object and you are between him and the object, and he misses the object and gets you, well, pardon me, but that is your fault. If he is biting to be released then that is a different issue altogether. As the owner you have to decide where the limit is. In all the years and all the dogs I have only had one that had to be corrected. My advice would be to keep spinning him up and keep correcting him or letting him know what he is doing is wrong. And build from there. If it persists you will have to make a decision.