So Tina is chasing Newt's Niffler, which notices the open office door to the left and immediately dives through. Tina, determined auror that she is, follows without looking at the plaque on the door. Eventually this leads to Tina kneeling under the desk and doing her best to keep hold of the mischievous Niffler...and the door opens, followed by heavy footseps. Of two people.
...or that time when Tina becomes an accidental voyeur on Graves/Any while the they try to have desk sex.
+ Tina mentally shouts really hard at Queenie about what's happening, like a play by play of a trainwreck that she can't stop watching.