The word should be 'loophole' or 'shortcut' instead of 'trick'.
The weak power of the Heavenly Dao in the mortal world was a trick for Heaven Realm disciples who could not comprehend the Great Dao in the Immortal World.
Maximum Comprehension: Taking Care of Swords In A Sword Pavilion
In the next moment, all the hair on its body stood up. As if it were a bolt of lightning, it streaked past and instantly appeared 50 meters away from the training hall. Then, it instantly returned to its original spot.