Learn the tone, meaning, and better English alternatives around "i don't understand" with real scene examples.

It means the speaker cannot figure out how the person got away unnoticed.
From Mafia Lord'S Son Has Secret Love For His Stepmom, Episode 39
Someone is confused about how a guard failed to notice a person leaving.
Use this when questioning how something happened. It works in mystery or problem-solving talk, but the full sentence is not a common fixed phrase.
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