There's wind?
Bai Wushang froze, and then was a little surprised.
A breeze meant that the cave was connected to somewhere, and wasn't a dead end.
That place might be the true habitat of the Spectral Viper!
Bai Wushang no longer hesitated, keeping himself fully vigilant and going deeper into the cave.
In the darkness, there were strange rustling sounds from time to time, and some bats, rodents, and insects could be vaguely seen, but probably because of the incense bag, these creatures didn't approach Bai Wushang.
Along the way, Bai Wushang found that the passage had no forks, and was far better to traverse than expected, except that it was too deep and long, and it took 30 or 40 minutes before he saw the exit at the other end.
There was light at the exit, very faint and just like the feeling of a pale moonlight spilling down at two or three in the middle of the night.