Why won't this stupid bat catch fire, what does he have to-Why are there vines shooting out of the ground?

"Did you do that?!" he says, glancing behind him at Greg, "that's wicked!" Greg could tie the creature up! Or make some kind of killer Nox-eating plant! He's so jazzed he completely loses his focus on the fire, and doesn't notice the sparks starting to snap around the thing's feet and on the plants, igniting them.

"What're we gonna do about the horse?" shouts Casey as he backs up from the thing. "We can't outrun that thing!" Well, Casey might be able to skate away from it but Greg doesn't really seem like much of a runner.