The music becomes a lot scarier after gas leaks from the truck spreads into the forest, but this is taken up to eleven when a freaked-out Michelle runs off and eventually makes it into her house, which is full of poisonous gas causing everyone to panic and Abigail runs in after her. Now keep in mind that Abigail is a young girl going down an underground passage full of deadly gas and when she finally makes it to the bottom, what's the first thing she sees? The bodies of Michelle's dead parents. This is all while trying to reach and move her younger friend to safety, because she had been poisoned by the gas and was now unconscious and close to death herself as a result, all the while trying to keep her mouth covered so she doesn't inhale any gas too. This is why Abigail's bravery is so highly regarded by the others. This is a pretty intense scene for a G-Rated movie.
Even the way the gas is depicted is chilling. Since it flows in a trail and specifically curves to go inside Michelle's house instead of sending a few tendrils out as it passes, it seems like it's alive and actively looking for things to kill.
The scene with the owl counts for this all too well, with Abigail's surprisingly sharp teeth.
The Furlings wind up in the Land of the Yellow Dragons and have a mad dash for their lives as the construction equipment works around them. From their perspective, they're surrounded by giant monsters tearing apart the land and trying to eat them or crush them to death at every turn.
The scene where the humans return to clean up the mess, and Edgar gets caught in a trap. The humans are wearing hazmat suits and carrying flashlights. From the animal's perspective, it's like an alien invasion. Luckily, it stops being scary when one of the humans frees Edgar and proves that not all Humans Are Bastards.
