I'll bet Hannity played it really carefully and only told the truth about Kimmel that he could prove with Kimmel's own published videos, or he lied about him by mirroring some recorded lie that Kimmel made about Trump. Then if he is sued, he can show the videos and claim the same artistic licence that Kimmel claims when lying about Trump.
If the judge agrees that Hannity wronged Kimmel based on the evidence then this would set a legal precedent that would end up convicting Kimmel for the same statements.
And if Hannity warned Kimmel in advance that he would be doing this, Kimmel can't even sue because he would be violating his satanic oaths. He lost fairly in accord with satanic natural law.
If you decide to try something like this on a satanist, beware. After you tell them what you will do to them, they might kill you to prevent it and win brownie points from Satan. Hannity was well protected when he did this.