Affecting luck was nowhere near as simple as one would believe. Even with the effect of Daniel's system, the changes created by his power were specific, and at the same time, extremely vague. These changes existed in time and space, and his luck only allowed them to have a lower, or higher chance to manifest.
For example, when affected by Sewah's negative luck, Daniel had been forced to face numerous unlucky events in his travels. However, it wasn't his negative luck that had created those events. His luck had only controlled the small events that led him to make a decision that, ultimately, put him in front of these unlucky events.
Like a small fish forced to swim inside an ocean formed by an infinite number of currents, he could only swim in hope that the next current that caught him, would not carry him back.
