In Rákshas form thy shape disguise, Terrific, like a hill in size: Let thy red eyes with fury glow, And high as heaven thy body grow. With fearful tusks the chief defy, That we his power and strength may try. He will with guile thy hold elude, Or own thy might, by thee subdued.”

In plain words: The gods tell Surasa to take the form of a huge, frightening demon with red eyes and tusks. They want to test Hanuman's strength and see whether he will escape by cleverness or be beaten.