As long it's alive, it will spawn the Yellow Tiny Roundhead Drills everywhere within the stage. This behaviour can be pretty annoying as the digging nature of the Red Roundhead Drill and it's spawned enemies can lead them to multiply without the player beign able to stop them. Piercing attacks are strongly reccomanded for the stage. The Red Roundhead Drill can't attack on it's own, which is very useful to defeating it. Grinding players can keep it alive in order to farm Gold and XP from the enemies it spawn.