I love the song "Lost Stars" from the movie "Begin Again"
and there are these sentences in the second part (paragraph):
Who are we? Just a speck of dust within the galaxy?
Woe is me. if we're not careful turns into reality
Don't you dare let our best memories bring you sorrow
Yesterday I saw a lion kiss a deer
Turn the page maybe we'll find a brand new ending
Where we're dancing in our tears
What is the meaning of the expression "I saw a lion kiss a deer"? Is this a metaphor or slang?