Careful...assumption has killed many...
Please note that many of the Asiana Captains are round eye type. And as Ferris quoted from the NTSB report. Asiana captain did identify the conflict and executed the miss...looks by the book to me.
If you are not familiar with ops at LAX, it's not uncommon to have an aircraft lifting off at the departure end while one is touching down on the approach end. Or traffic departing on 25L and landing on 6L simultaneously!
They will also clear you to land with an aircraft rolling or about to roll on the runway.