He needed to open those doors. Not just to let the others inside but also because the smoke from the burning tank was filling up the room. He could not use the tank itself because he already destroyed it.
He would have to destroy the doors himself. As he walked toward the doors he looked them over. They opened outward so the hinges were embedded in between the door and the doorway for security. But the door was opened by hydraulic machines that pushed it open and forced it closed from this side.
There were three hydraulics on each of the doors. He aimed at the left door's top hydraulic and fired the tri-barreled cannon. It shook his body again. While the bullet slammed into the top hydraulic there was a loud clanging followed by the loud noise of air escaping from the container.