That could be it -- or could it've had something to do with the ghosts? Don't ghosts possess people in some stories? [ Should he just treat anything as possible??

Regardless, his point is: ] We don't know enough to make guesses. We should see if more people talk about it; maybe something happened to the friend that Daan didn't see.

But we can warn everyone about what's in there. [ ...actually, since he's saying that: ] What was in there? Was there a party?