When we envision how angels act in this world, we often think of them how modern movies and TV shows depict them. We think they generally look like humans and while we walk down a sidewalk, they are right at our side walking with us. If we walk faster, our angel is obliged to walk faster with us.
However, the truth is much more mysterious than that.
The Catechism of the Catholic Church explains that, “As purely spiritual creatures angels have intelligence and will: they are personal and immortal creatures, surpassing in perfection all visible creatures, as the splendor of their glory bears witness” (CCC 330).
In other words, angels do not possess a physical, material, body. This means that they are not restricted by the movement of their bodies as we are. The concept of a pure spirit that is not bound by space (or time) is difficult for our minds to process.