Well, you could assume he is traing like that for a reason, and ask him kindly to hold for a moment while you land.
Some folk need a fair amount of slapping about the head before any sense dribbles out one ear.
Where, when and who?
Maybe somebody will know them and have a quiet word.
You do get the patience award my friend because I reckon after a while I would have had some serious landing lights pointed at him from the other end of the field to wake the fecker up!
