The release is the bite.

SchHFan
I think you can find some very good training info on the hold and bark if you go to this training article at this web site http://www.schutzhundvillage.com/hb.html

This is a problem that many Malinois have, although they do not have the exclusive on it! It seems to happen with alot of dogs that have a little bit of hectic energy or are a little nervy. Sometimes the compulsion method of slapping or whipping the dog when it spins does work depending on why the animal is spinning. If he is a little hectic you may make him more hectic, and in turn he will not be able to think clear, and that will cause him to be difficult to control; and thus possibly making him dirty. If he is nervy he may start to load a bit and once again get dirty. You will beat your head against a block wall! Most of the posts make valid points, but my 2 cents says take it slow, so you don't create more problems with the animal. It most likley would be best to do this work off of the field if at all possible. Putting the animal on a pole, back-tied with a leather collar, and have a pinch on him also,(with another line) have the decoy load the dog up a bit, and then you pressure him into a sit, hold and bark. When he starts to sit give him a bite. Over time when he is sitting walk up behind him and pet him camly. This might work. I believe that this would be a safer method then using stick hits if you are not sure on why the dog is doing what he is doing. It is hard to give advice on what to do with the animal without seeing him, so the above-mentioned is just some idea's that I havc found to work. Good luck.