Have more agents

Remove the filter words and give the environment some agency.

"Alex was breathing so hard that his chest was burning. The rich smell of soil rose up from the forest floor, which was cool and soft between his toes. With no moonlight filtering through the forest canopy to illuminate the ground, he didn’t dare look over his shoulder. What if he tripped? Behind him, the monster crashed through the undergrowth, its hideous odour the harbinger of death."