Han Sen kept track of how long it took for the light to fade and the shroud of invisibility to return and cloak the scorpion.
It took ten minutes for the invisible scorpion to disappear from sight. And it got Han Sen thinking, "It would be best if I could kill it in under ten minutes, in that window."
Han Sen decided to strike the next time it came out for some moonlight refreshment.
Of course, the full moon that drew it out only occurred once a month. If it came out for each full moon, like clockwork, he'd be waiting a while, but Han Sen decided to remain and see if there were any other events that would compel the scorpion out of its lair. He stayed there for a few days.
With time to kill, he focused on refining his Life Geno Essences while he observed the valley. Now, he had eleven super geno points.