As a treasure transformed from a Chaos Pearl, the Dao Mirror shares the same origin as the River of Time and Space and naturally can borrow its power.
Boom!
The River of Time and Space surged mightily, engulfing a Quasi-Saint, sweeping him into its flow, with no one knowing where he was carried off to.
This river may look like just a river, but in reality, it is a congregation of countless fragments of time and space, where each wave is a world, a replay of scenes from the past.
The Quasi-Saint was caught up in it, and with good luck, he might be washed to the Ancient Times and still be able to return alive. If he were swept into the great battle between witches and demons, even as a Quasi-Saint at the peak of his powers, transcending the River of Time and Space, he would likely not escape unscathed and could be seriously injured.
If he were carried off to an unknown future and encountered the future Jiang Chen, he might even face the possibility of falling.