You can't just disregard Immutability. Unless it's divine, which it's not, you can't just disregard Immutability (OR Invulnerability if either of them had it).
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)