This sounds like resource guarding. The eating fast is a sign of it, then when your husband grabbed Mick it just confirmed to him that someone was out to get his resources (the food).
The link that Pat provided has a good discussion.
I would really recommend getting the DVD The Language of Dogs, http://www.dogwise.com/ItemDetails.cfm?ID=DTB875P, it sounds like Mick gave a lot of signals that he was going to bite before the bite actually happened. Learning to read those signals will really help to prevent situations where Mick feels the need to escalate to biting.
Some things you can do to prevent this situation in the future. If you are worried he is eating to fast, one recommendation I saw for slowing the pace a dog eats at is to put a tennis ball in their dish so they have to keep moving the ball out of the way to get to the food. You probably should also feed in the crate, so that he is less worried that any people around may take his food.
You are going to need to work on the resource guarding, a good source of information is the book Mine, http://www.dogwise.com/itemdetails.cfm?ID=DTB740