They are afraid of the Red Bull.

4 seconds sound clip from the The Last Unicorn movie soundboard.

You can hear this line at 01:11:31.984 in the Blu-ray version of the movie.

Quote context

[...]

- You made me wonder for a little while. But your time is done.

- The tide is turning. Come and see. Come here.

- There. There they are. There they are! They are mine! They belong to me!

- The Red Bull gathered them for me one by one, and I bade him drive each one into the sea! Now, they live there.

- And every tide carries them within an easy step of the land, but they dare not come out of the water!

- They are afraid of the Red Bull.

- I like to watch them. They fill me with joy.

- The first time I felt it I thought I was going to die.

- I said to the Red Bull, 'I must have them. I must have all of them, all there are, for nothing makes me happy, but their shining, and their grace.'

- So the Red Bull caught them.

[...]