The team knew that they need to make sure that they seamlessly perfect the skill synergy. The first that will act will be Adrian as he will need to reverse gravity and make the Horseman of Death float in the air. The next that will move will be Alder as he would use an arrow to try and knockback the Horseman of Death.
The next step after that will be dependent on the fact that they are successful. The people that are in the plan are in position, but the distance is one kilometer from the Horseman of Death. That is the area of perception of the Horseman of Death and any living being that gets inside there will be detected.
Adrian flew above the Horseman of Death, and it detected him, but the latter did not move. Adrian could already see that even the Horseman of Death will not make a move unless he enters the one-kilometer area of its perception. Adrian wanted to know why but he already has a few guesses.