If you would be invited to say Philippines, Indonesia (which covers Bali too), Myanmar, Laos etc. that should raise an eyebrow.
If the deal is more akin to "get in this van and my guy will take you to where you need to go", then that's another story.
a large number of situations, contrived or otherwise, can result in emergency diversions.
you may want to be sure a connecting flight is legitimate when travelling in 'suspect' regions.
this would be high profile kidnapping, but a source of non SEA persons, that would be more convincing, and a source of international ransom revenues, espescially if they were also accused of some crime.
That could have been their pickup from the airport.