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They had just started

To cross this queer bridge when a sharp growl made them all look up, and to their horror they saw running toward them two great beasts with bodies like bears and heads like tigers.

"They are the Kalidahs!" said the Cowardly Lion, beginning to tremble.
"Quick!" cried the Scarecrow. "Let us cross over."

So Dorothy went first

Holding Toto in her arms, the Tin Woodman followed, and the Scarecrow came next. The Lion, although he was certainly afraid, turned to face the Kalidahs, and then he gave so loud and terrible a roar that Dorothy screamed and the Scarecrow fell over backward, while even the fierce beasts stopped short and looked at him in surprise.

But, seeing they were

Bigger than the Lion, and remembering that there were two of them and only one of him, the Kalidahs again rushed forward, and the Lion crossed over the tree and turned to see what they would do next. Without stopping an instant the fierce beasts also began to cross the tree. And the Lion said to Dorothy: