In the situation presented, a sensible pilot would orbit and if he/she considers that wasn't enough when on final approach,
fly above the path of the previous and aim to touchdown upwind
of the plane's touchdown point.
If you consider it is NMP (not my problem),in the event of an accident, the subsequent court of enquiry would take a v. dim view because you could have and should have instructed the pilot to go around. Duty of care these days means if you were there, do something about it; doing nothing is not an option. If the pilot attempts to land despite being instructed to go around, the ATCOs can only watch with their finger on the crash alarm.