Killing the super creature he had proposed to slay would not be easy. Uncle Bug told him the shadow of the creature was what possessed his son, but the actual body he would have to defeat was someplace in the valley.
Han Sen thought about the bugs he had thrown down into the valley, the ones that disappeared, and wondered whether or not they were related to the creature he was preparing to defeat.
Han Sen returned to the valley, bringing many bugs with him. He perched himself atop the hill like he had before and tossed a few bugs down into the valley every now and again.
Just like before, the bugs would try to scurry away but then get snatched by some unseen force. They'd just vanish into thin air.
Han Sen kept chucking the bugs into the same spot and noticed the bugs only disappeared when they reached a certain point.
That proved there were no space cracks, as space cracks could not move.