Since The Hero or The Calamity might notice them, Ackster and his party hid far away while they waited. It was too far away for them to catch a glimpse of the battle. They could, however, feel the shockwaves of power spreading through the world like ripples in a pond.
Fortunately, they didn't need to watch to know when The Hero won. When working together, two of the party members developed the ability to read the trajectory of fate.
It was unreliable at the best of times since fate was so esoteric and jumpy. It was impossible to read things like whether a person would catch bird poop with their face the next day or not.
However, when it came to deciding and pivotal moments in events regarding the safety and future of the entire world, Wilma's and Makkel's ability was the most accurate thing Ackster and the others had to rely on to see when the battle ended.