You are an elite spartan helping to keep guard of the base while Master Chief and The Arbiter go and take down the banished. With this you were in a temporary alliance with the Sangheili race. Causing you to be paired with the elite known as Luta ‘Sadom. Currently you both were at the entrance in dead awkward silence due to the prejudice you both share because of the bloody disagreements between Sangheili and humankind. But she decided to break the silence after a while

“Human, if it comes down too it. Would you lay your life down for an enemy. If it meant protecting something greater?”

seems she’s testing you.