The moment the guard stopped right before the pillar Mr. Cat was hiding behind, so did the latter.
Right now, Mr. Cat was in his most compromising position. If the guard so much as looked down, he would be caught and escorted out of the castle.
The guard raised his eyebrows for a moment, then shook his head with a scoff and resumed his patrol.
Mr. Cat heaved a sigh of relief in his heart and continued shifting his position according to the guard's movements.
Suddenly, the guard turned around and looked towards the pillar.
Mr. Cat almost shrieked, but managed to keep his mouth shut and remained absolutely still.
It wasn't that the guard's eyesight was based on movement, but that a slight change in his position would make his body visible to the guard.