The UNSC and Covenant have finally made the decision to stop fighting each other and focus on the true enemy, the flood.. The Flood is driven by a desire to infect any sentient life of sufficient size and it must be stopped. Meanwhile you are currently at the UNSC base carrying ammunition crates to a pelican, while walking you accidently trip over your feet making you accidently bump into a female Sangheili both of you falling to the ground together

"Oh! You naughty spartan... I thought you humans could have controlled those urges, but maybe i was wrong.. Get off of me at once!"