I think Quinn made Mona to make a move on an older man on this party.
Now that is actually a good observation.... We know several things about the Free tuition scheme :
Burke, when arguing with Jade (scene with Jade throwing photo frame), admits he had sex with 3 students...
From a Riona and Quinn scene we know Riona has free tuition, probably Quinn too but that's a bit vague...
But the restaurant is linked to the free tuitions.... Think they say there's 4 tuition girls now...
Girls in the restaurant : Quinn, Riona, Sarah, Camilla, Melanie (?)..
Camilla has no tuition, (scene with her when talking about Mona)
We know Mona was supposed to have sex at the prep party, but she didn't and left....
Burke was at the party for fundraising, so Was Mona supposed to have sex with Burke or with this Wallace dude that keeps popping up on scholarship files (that keep getting the names deleted lol)
Burke could have that sex planned any other day if he was the one that needed to be served to get the scholarship...
But the game mostly tries to make us assume it is Burke himself..... So knowing DPC, it's quite possible the really old guy at the prep party is the one that scared Mona running.....