That’s the supernatural element.
In Samson’s case, God could have brought the jackals. He’s God.
“Spiritual warfare is learning to recognize the strategies, refusing to cooperate with them, and aggressively cutting off the schemes of the devil in Jesus’ name.” Dean Sherman
“those who protest that God cannot exist because there is too much evil evident in life… Evil exists; therefore, the Creator does not. That is categorically stated… If evil exists, one must assume that good exists in order to know the difference. If good exists, one must assume that a moral law exists by which to measure good and evil. But if a moral law exists, must not one posit an ultimate source of moral law, or at least an objective basis for a moral law? By an objective basis, I mean something that is transcendingly true at all times, regardless of whether I believed it or not.” Ravi Zacharias
“But the Devil is no big threat to God’s purposes; he is not even remotely comparable in power. He has been given a limited time before his final judgment to try to prove his case, just as all other moral beings who have chosen to live in rebellion against heaven.” W.A. Pratney