Fitz and Simmons are pretending to be purposefully ignoring the happenings in the UK regarding Scottish independence, knowing that they would argue badly if they were to indulge in the unfolding history whilst in each other's presences.
This doesn't stop them from indulging in private.
Jemma cannot lie to Fitz so she blurts out that she's been keeping up with the events and Fitz confesses to following the stories. They begin to argue and soon it turns into a full-blown debate; Fitz is all for independence while Jemma is against it. Skye puts the arguing scientists into a closet and locks the door, telling them that they won't be let out until they have agreed to disagree and ended their argument in a truce. Jemma and Fitz argue angrily before falling silent and murmuring their apologies to each other.
A few hours later, Skye opens the door to find the two scientists curled up in the corner, asleep in each other's arms, their argument clearly resolved.