She had let her guard down and was just standing there looking at the dead agent.

This is a girl who does not let her guard down easily.

But no one can do anything to her because she never lets her guard down.

Eventually, she would have to let her guard down.

Just as she began to let her guard down, she had been used.

She'd let her guard down, and now it might cost them.

But now, after-hours and in another city, she let her guard down.

She had let her guard down and they had taken advantage of it.

She knew better than to let her guard down.

Perhaps that was why she'd let her guard down.