None,
Did you listen to the recording?
Which aspect of the event needs clarification for you?
To my untrained ear the switch from "right" to "left" in a high stress situation was not all that clear. As in I would have expected the pilot to be told something like "Cancel clearance to land on 27R... You are now cleared to land on 27L"
Anyway it ended well and they didn't have to go around as 27R was clear.