Watching the bug on Bonnie's head, Yang Yi pondered a question: should he discover it, or should he not discover it?
Bonnie should not have been able to find the bug on herself. Therefore, although she discovered it, she had to pretend she didn't and carry on with what she needed to do with the bug still on her.
However, as a spy, if Yang Yi couldn't discover the bug, it would mean there was a problem with his capabilities.
But should the bug be discovered?
If it was Aaron sending someone to monitor Bonnie, Yang Yi could just find the bug and casually throw it away, but if it was Aaron who arranged this, then the job was done rather sloppily.
If it wasn't Aaron who sent someone, then who could be monitoring Bonnie?
To discover or not to discover, that really was a question.
Yang Yi pondered for a moment and then he decided not to discover it; therefore, some logical events had to unfold between him and Bonnie.
