Since the cave was here for a long time and was manually carved out, it was obvious that it would erode from the natural elements after time. Because of this, small pieces of rocks and soil would fall from the ceiling from time to time.
Some of these would fall on the barrier that surrounded the spirit Qi spring. But the barrier would not let them fall inside, because of which they would roll off it and fall around its edges.
While this was a very mundane thing, it gave an important bit of information to Lin Wu.
"Oho, so the barrier does not set off an alarm when it is touched. Though it should depend on the level of impact that is levied on it, seeing as the small rocks do not affect it. A light touch by someone should have the same effect I presume." Lin Wu hypothesized.
'Let's see if my estimation is correct…' Lin Wu thought before extending a very small part of his tail forward.
