After the spike, we fall backwards into the actual forbidden forest and *here* we go past the centaur into the devil's snare, then drop, and finally escape from more skrewts at the bottom.
I always thought the centaur would be waiting for us at the bottom after dropping.
Also, I'm sad that he doesn't move or speak, but we go by him way too fast to notice any movement or sound anyways, even if they had it.