The beast disappears into the darkness ever so slowly, and the stench leaves with it. After waiting for a time, you proceed down the tunnel.
Shortly afterwards, the tunnel splits in two. You can feel the foul smell in the right tunnel. On the floor of the left tunnel is a three-foot-wide trail of some transparent, slimy substance. There also seems to be more of the tiny critters in the left tunnel.
Remus: Harry... I'm a werewolf.
Harry: Are you fucking serious?
Remus: Well yes, but I don't see how that applies here.