Hulk BFR's Ultron and gets Nefaria in a prison-rape fullnelson. Bill comes in windmilling and makes like Gallagher with Nefaria's f*cking head. And then Ultron gets back and Hulk and Bill stomp him into the ground. Then Hulk pitches Ultron for Bill to hit a grand slam to the sun.
Hulk ground-pounds to take the other team off balance. While he gets Ultron in a prison-rape full nelson, Bill kneecaps Nefaria to drop him and then Bill does goes Gallagher with f*cking Nefaria's head. Hulk then shoves Ultron to Bill who cracks him a good one to keep him dazed. That's when Hulk reaches from behind Ultron and rips Ultron's head off by the jaw.
Look, obviously I'm playing around a bit here. It wouldn't be that easy. But I think it's entirely possible for Bill and Hulk to take this.
Even the classic "indestructible adamantium" Ultron was destroyed. And the secondary one was crushed by Wonder Man.
Every single time Ultron's been destroyed, you know what they have in common? The head survives. It would seem a logical theory that the necks on Ultron are weaker than the rest of him, either by design limitations inherent in the delicate nature or the complexity of the neck or as an intentional fail-safe pending destruction of the body. But it's a fact that, as far as I know, every single time Ultron's been destroyed, the head remains intact, with a majority of - if not all - the damage being on the neck portion. I think it's very possible, considering what Hulk did to Onslaught, that Hulk could muster the power to rip Ultron's head off.