The gas elimination bomb was indeed an awesome weapon. A large area of air was sucked away, and inside the bomb, a massive amount of freezing gas was generated. Even the fiercest beasts, after being injured and then encountering such a weapon, could no longer resist. Deprived of air and under the force of that freezing power, even the most formidable beasts fell.
The power of the gas elimination bomb combined with the authority of two fierce beasts silenced a large area quickly, and the wild animals all fled far away.
Watching through the satellite as the two fierce beasts died, Peter Brown didn't rush forward recklessly but remotely controlled an unmanned aircraft to fly to the location of the beasts. He even used the drone to ram the beasts to ensure they were indeed lifeless before he quickly drove the flying car over.