When undisputed heavyweight champion of the world Tom Aspinall steps into the Octagon for UFC 321 on Saturday night to defend his title, he will do so believing that there is a non-zero chance he could die. “Essentially, you’re putting your life on the line in front of millions of people. That might sound a bit extreme, but bad things can happen in there,” he told CNN’s Becky Anderson earlier this week. “I don’t want to die in the cage. I definitely don’t want to. But it’s a dangerous sport.