Clark's speed was enough to dash forward and pull Grace back. The first finch had sensed the impending danger the moment that grace had stepped forward. A large plant lid colored like the ground and grass beneath it opened up revealing the purple acid that was the stomach of the purple acid trap.
The first finch released a burst of icy air that forced the insides of the plant to freeze. The downside of such a beast was clear. It was adjusted to grow in humid and warmer areas. Not cold.
Therefore, when the layer of frost covered it and the cold air kept coming, it reacted by attempting to dig itself deeper in to the ground. Unfortunately for it, the frost finch was angry. It's tamer had just been attacked right in front of it. Regardless of the reason or the fact that the beast was unable to see, the cold air only grew stronger.