After using his Dongxuan Aura to scan what he could of the pit, Han Sen was unable to detect the presence of any creature residing in the dark down there.
If some creature had been disturbed by Han Sen's coin, and somehow survived, it should have all come scrambling out by now, anyway.
So, apparently having nothing to fear, Han Sen decided to investigate the hole—feet first.
The pit he had created was enormous, and a few klicks deep without a doubt. A haze hung thick in the air after the previous explosion. As Han Sen neared the bottom, he could see how ravaged and frighteningly violent the power he had unleashed really was.
At the bottom of the pit was a tunnel, strangely enough. It was not a natural formation, he could tell, and it seemed to lead in a certain direction.
The light Han Sen had glimpsed probably came from there, and this was confirmed when he saw the same flicker cross his vision as he peered into the tunnel.