(Modify later) Xu Huo can now see images of the past, primarily because this Chaotic Space is filled with Time Force; the recorded time fragments occasionally appear on their own. He enhanced the Time Force within this special site through the Angel's Eye, allowing him to further perceive the Time Rays. To some extent, he's able to manipulate the Time Rays to go back to the past— just like how he initially achieved Psychic Power's external release with the aid of the Seventeenth Hospital's space when he first underwent Spirit Evolution.
From this perspective, theoretically, he could trace back the past of any place in the entire city as long as it had been recorded.
After a slight hesitation, Xu Huo returned to the Nine Great Divine Paths and found a doorway with an eye pattern engraved upon it to start the time reversal process.
