 " On [ the music video ] , I really just wanted to put the mirror back onto the whole experience . You can see that she had that kind of confidence . And , literally , every take became a more and more confident take , so that she could have fun with what was going on . Not being over @-@ the @-@ top sarcastic , but ... having a laugh at everything that was going on around her , with confidence . [ ... ] The very last dance of the piece , she had her hair up , and I go , ' Can you just do one for me with your hair down ? ' She dropped her hair down . You 'll see we intercut with her hair up and her hair down . That was the last piece . She just rocked it from her heart . She choreographed that last dance at the very end . She did that on her own and said , ' Let 's go for it ' " . 
