How are Dorothy and her friends able to get past the hammer heads?

Dorothy and her friends are able to get past the Hammer Heads by using their wits and teamwork. When they encounter the Hammer Heads, which are hostile creatures, they cleverly trick them by distracting them and taking advantage of their confusion. They also rely on the Scarecrow’s intelligence and the Tin Woodman's bravery to navigate the situation safely, allowing them to move forward on their journey to see the Wizard of Oz.