"Sh*t! Why are they here?" Han Sen reacted immediately, directing Little Star to dive back into the dark river.
Before Little Star escaped beneath the dark waters, Han Sen felt a frightening wash of power come for him. Within one second, the river was vaporized into nothing.
Han Sen summoned his Demon Bug King Bai Sema to block that frightening attack, but the shield was damaged so much that it cracked. It was on the precipice of shattering completely.
Fortunately, Edward didn't really want to kill Han Sen until they knew if he was carrying the relic. If they killed him right where he was, and he didn't have the relic on him, there was a chance they'd never find it. If they had simply wanted him dead, then the Demon Bug King Bai Sema wouldn't have been able to survive their attack. It would have broken.
Even so, the Demon Bug King Bai Sema could no longer be used. So, Han Sen put it back in his Sea of Soul.