Tough Choice
When Rudy had fought Jane for the first time in the forest, she had used the vampiric ability that allowed her to change her forms. She turned into a bat and also into a fog.
Rudy's power was to create an ability based on logic, principles, foundations, or even a strong belief and faith. He had to convince himself somehow to make the ability work.
However, he had no need to do all that if such ability already existed with someone.
Rudy had to search the entire underworld to look for Rusher and the others, but it was too big and the time was close to none. At first, Rudy flew as high as he could and used his 'all vision' ability to scan the entire underworld at once, but he failed.
When he had used 'all vision' for the first time, he had gone blind instantly. When he used it for the second time in the Ross estate, he was able to use it for one second. But when he used it for the third time to scan the entire underworld, he became blind in three seconds.