Apparently the trail leads to the EMERGENCY EXIT, which had it's door removed. You can smell that the blood is still fresh, implying that whoever made the trail was here some seconds ago, i.e., passed by here while you were facing the party.

The frequency of the blood drops also implies that the guy that passed by here was very injured, likely because got into a fight in the KITTTEN ROOM.

All the pieces are slowly comming together and revealing the real truth behind this party. And every discovery you make also creates a new concern above your friends.