I am not too sure if these are the only such lines, but here is one deifinitely good answer:
'My will to her consent is but a part.
An she agreed within her scope of choice"
They are from Scene 2.
Those words mean that Capulet's daughter is free to choose her husband, at least in part (with the father's agreement)
Answer:
He receives help from the supernatural.
Explanation:
It is shown in the passage that he is assisted by Shamash. In mythology, Shamash is the son of the moon god Sin and the brother of the goddess Ishtar. Shamash's power that he uses to aid Gilgamesh's character an be perceived as supernatural, as such things as throwing strong winds is <em>not</em> something a mortal can do.