So I take off my mask and ask
“did your partner remember to cut the line for the panic button in the back?”
And she paused
The look she had on her face was cold as ice

from B.o.B – Cold As Ice Lyrics on Rap Genius

Meaning

They forgot to cut the lines, meaning another employee hit the panic button and the police are on their way, and this leads into the next line.

“The look on her face was cold as ice.”

The line suggests she purposefully didn’t cut the lines so that he would be caught and she is bitter for making him plan to rob it in the first place.

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