Root doesn't have much time. Whatever message she sends to Shaw has to be short, punchy, unidentifiable to Samaritan, and indisputably from Root. It has to be right and it has to be now. The universe has given Root this chance to make contact. Shaw needs to hear that she's not forgotten.
There's an agent at the studio door. Root taps out her message, remembering Shaw's lips in that last desperate kiss. She's sending Shaw's own words floating back to her. Root's a four-alarm fire in an oil refinery and nothing can stand in her way. She's getting Shaw back.