Huckleberry, 10.5 months, does excatly the same thing, out of no where on a walk, on leash or free, he will jump, bite, growl, and be a general ass. Turning my back only made him run in circles to bite my shoulder, saying 'no' was spit in the wind. I would also grab him, mid jump, and put him on his side, usually with a hell of a fight, and wait for calm. I would grab his mouth, scruff his neck, yelp, ingnore, distract with treats or food, nothing worked. You've got to remember these hounds were bred to harass and wear down large dangerous game, to death, a human stands little or no chance winning that game. But a week ago I found the answer, I tied his leash to a tree and walked away. That took the fight right out of him. He was too confused to fight the leash, just looked at me with that 'where are you going' look. I walked maybe 20 feet, stood with my back to him for 60 seconds. Turned around, told him to sit, 3 minutes later he did it and as soon as his little butt hit the ground I gave him love and praise like he saved a drowning child. He was good for another 15 minutes, and started his attack again, tied to a tree again, he sat on his own before I got 10 feet away, got some more love and off we went.
Its not perfect, when he's off leash and starts this, he's damn hard to catch, but as soon as he's lashed to a tree or fence, or anything, even my belt, he gives up, sits down, and I stand over him like I'm tough stuff, and let him off.
I invested a heavy duty carabiner, cliped it on the loop on the end of the leash, that makes it quick and easy to tie him off. It is the only thing that has worked for me.