If you ask what the strangest skill Bai Yanliang learned in the mental institution was, it would undoubtedly be lock-picking.
During that time, he read a suspense novel called "Genius Locksmith," and the only reason he read it was because it had won the Edgar Allan Poe Award.
Out of sheer boredom, Bai Yanliang spent some time studying lock-picking and successfully unlocked most of the hospital doors without any doctors or nurses noticing, wandering around the hospital in the middle of the night.
This time, he unlocked the door leading to the rooftop.
Generally speaking, if he couldn't force a door open, he would consider picking the lock himself, because the way he picked locks was really unsightly.
However, considering the noise made by kicking a door open, Bai Yanliang had no choice but to pick up this craft.
As for the second strange skill, it was speed descent.