Both shoes had paperclips inserted into them, and then tampering was done to the heel of one of them. Such actions clearly suggest someone inexperienced was behind it.
Because once one foot gets injured, generally, the other shoe wouldn't be tried again. And once there's a discovery of paperclips on the sole, they naturally wouldn't be worn on the runway anymore. In this case, tampering with the heel becomes superfluous.
So, it's evident that the person who tampered with the shoes had no real experience in causing harm and ended up making such a foolish move.
At this moment, Alexandra Lee, who had already changed into a new outfit, nervously stared at Keira Leaf, a flicker of both expectation and hesitation flashing in her eyes. On one hand, she felt uneasy about why Keira appeared as though nothing had happened; on the other hand, she still harbored hope that Keira would make a fool of herself.