The trail shows its flinty side

The hike from Darlington shelter to Duncannon starts easy and then becomes a soup of sharp rocks. At one point, it turns into vertical loose dirt, and I fell on my face cursing, hands clutching trekking poles shot out to the sides of me.

Then the trail gets evil.

[you can't see it, but this rock slide starts hundreds of feet up the mountain and continues hundreds of feet down it]