[quote=@Skwint]
How the hell do you slice someone in half with a knife? Did he take multiple swings until he got all the way through?
[/quote]

He's both that strong and skilled to do that, it's not an exaggeration when lots of heroes (And sometimes villains) pulls their punches on normal people. Korbl in this case didn't and ended up outright just cutting a man in half.