However his psychic ability has its limits as he was unable to match the speed of Quicksilver's attacks. His lack of superhuman physical powers contributes greatly to his unwillingness to confront genuine superhuman opponents such as Spider-Man, Luke Cage, or the Hulk, as their vastly superior physical abilities would render his ability to predict their actions useless; Quicksilver mocked him for this by referring to him as "the least dangerous man on the planet." Wolverine has also managed to defeat X in combat by provoking himself into a berserker rage while they fight, thus preventing X from predicting what Wolverine will do next as Wolverine himself is unaware what he shall attempt in that state; Iron Fist has also managed to defeat him in a confrontation by relying on the unpredictable Drunken Master style of kung-fu.