 Whitehead didn't mean any harm. He thought he was just... Doing the thing? Yeah, recreating the same trick he'd just seen Houdini perform. But Houdini wasn't prepared to be punched like that. He wasn't flexing his solar plexus, steadying his stance, and holding his breath like he normally would before the trick. Whitehead caught him off guard. Houdini waved him off, clearly suffering. The next day, Houdini woke up, doubled over in pain. His appendix was ruptured, almost certainly from Whitehead's punches. And then Houdini died.