And I may be all wet(!). He may have you playing the bite face game, so your "retaliation" is feeding it. Set him up in this case for failure. Give yourself some room. Instead of tying him, just drop the rope or hold it, do what you normally do, and every time he tries to grab, move his feet off quick and BIG and make him work - small circles, changing direction, backing, etc. Works well with a 12' lead, but not necessary. Then go back to what you were doing. Rinse and repeat, and repeat, etc. Remember that he who moves his feet least wins (I think that is an Ivey-ism). He may decide that trying to play that game results in just too much work, and you will have demonstrated that you can "push" him around. Horses push other horses all the time. He may have just always been the "push-er" instead of the "push-ee". After you have done this a few times, then you can try moving his face away from you without touching him. Also, this may be a horse that you may want to be fairly even with you when you lead. If he is behind you, he is doing the pushing. Disclaimer - I am no trainer! This idea is disposable!!