"It is a memory. They cannot harm you if you do not believe they can." At least, that's how it works in the Fade, so that's how Justice is assuming it works here. Hopefully he's right, because the darkspawn are turning towards them.

Justice scans his surroundings, searching for a thread that doesn't quite fit with the rest of the memory.

There's a odd glimmer on the ground where the Blight has rotted away all the grass. He approaches it, crouching down to examine even as the darkspawn begin to approach.