Translation:The guards can't see us.
It's pretty difficult to distinguish that the speaker in this audio clip says "nulegh..." and not "mulegh...". Alone, that wouldn't be a problem, but when I typed "mulegh..." as my answer, it registered as correct, but with a typo. I'm not sure if the course runners could even change this or if it's built-in Duo functionality because the m and n keys are adjacent, but I feel like in this particular case it runs a high risk of allowing the student to miss this distinction. I don't know about everyone else, but once I see green and hear the happy chime sound, I don't usually even remember that sometimes the messaging beneath the success message might offer a slight correction or more info.