Don't look back, and don't run. You must never run from anything immortal, it attracts their attention.
7 seconds sound clip from the The Last Unicorn movie soundboard.
You can hear this line at 00:29:52.217 in the Blu-ray version of the movie.
Quote context
[...]
- No, she'll kill you! Run, she'll kill you if you set her free!
- Set me free. We are sisters, you and I.
- Not alone! You never could have freed yourselves alone! I held you!
- Run, run, run, run away from here, now!
- No. Come with me. Come with me.
- Oh, that poor old woman... I didn't want her to... I didn't know.
- She chose her death long ago. It was the fate she wanted.
- And you, you have no regrets, as I do?
- I can never regret. I can feel sorrow, but it's not the same thing.
[...]