Keep the Crippling Backstab on Enabled, please. I do not want to see a flying Spy backstab me before I can turn around. When Crippling Backstab was Disabled, so many people played as Spy to use the most favourite Spy perk... Leap. Leaping Spies then backstabbed me midair with their Leap and it was starting to get annoying. Glad that's over. The Cons? You don't get the kill, but your team (hopefully) must kill the wounded target in one hit or two.