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Like the giant, the evil one knows that something has been done against him but doesn't yet see the full implication. For a millenium or two he has been acting as if he thinks he can escape, but the cause of his final demise is on its way and will assuredly arrive.
A good illustration of this kind of behaviour is Colonal Gaddafi. In fact, we all do it. We carry on as if we will live for ever, forgetting that we might die at any moment. Muammar Gaddafi might die today or tomorrow from a heart attack or a stroke, a traffic accident or an assassin's bullet, a slip on the stairs, a falling tree or just plain old age. Yet he continues to act as if he might rule Libya for ever, despite the certainty that we must all die.
That is the same behaviour we see from the evil one, carrying on as if he may still win. Perhaps, like Goliath, he doesn't fully understand what Jesus, this little 'David', has done; the full implication of the cross. I am sure some things are hidden from him.
But it doesn't really matter whether he thinks he can win or not. What is important is that we know he has lost! We know that if we resist him he will run away. We know that prayer is powerful. We know that the enemy will try to distract us, confuse us, and misinform us. He will try to put doubt in our minds and despair in our hearts. But we also know that the Messiah has won the victory once and for ever. We know that we have a share in that victory. We know that it's a victory over death, but also over the enemy. Even captivity has been taken captive!
HalleluYah!
Rejoice, for Jesus IS Lord and King.