Completing Forsaken Prison unlocks the Evil Crow achievement and vice versa.

Currently in the chase sequence and got caught a couple of times and taken back to the checkpoint. However as I neared my goal (approx 60-70 distance) I suddenly got "caught" by something I didn't/couldn't see. I figured it came up behind me from the tunnel I had just passed. However instead of being taken back to the check point the screen just went blank but the timer remained with around 2 minutes left. So then I start thinking it might be part of the sequence and that I'd get control and the picture ba...