I watched it again in greater detail, and it is narrated by cortana, and not hasley for the simple reason that when they show hasley, one thing that she says is "So, you've mad your choice. Great minds think alike." since this is about the time that cortana is paired up with master chief in the timeline, and cortana was created using a flash clone of hasleys brain, the choice was that cortana was choosing john, and the statement "Great minds think alike." was hasley talking to cortana.