The sitting duck has no chance of escaping the hunter. Ducks fly with agility and speed. Ducks swim gracefully, but not with speed.
Ducks run ugly and slow.
A duck sitting in the water or on land has zero chance of escaping the undetected hunter. Satan is the hunter. Serving God is not merely a spiritual responsibility. God delivers us from evil in Jesus Christ for specific reasons. It allows God to express and fulfill His love for us.