He probably booked a round-trip and just took his flight back.That's why I love Laos, because you don't have to book flights and you're not dependent on any changing flight prices. You just take the bus and it always costs the same.
That's absolutely right, I just wanted to mention it, because the interviews aren't scheduled for a week. Instead, you receive the invitation via email in the afternoon, and you have to be at the consulate the next morning or at noon. The appointment times are intentionally so tight to weed out people who are already out of the country. I therefore recommend checking your emails regularly and planning a possible trip to Jakarta. Here's a link to a report from a group member who had an interview in Jakarta:
Somewhere here in the Facebook group I read a case where someone was invited to an interview in Jakarta. In the worst case scenario, you would have to travel from Bali to Jakarta, so you have to take that into account.
The best and safest is always your own home country. However, if you're already in Thailand and want to travel to the surrounding countries and apply there, I would personally recommend Laos. They will invite you for an interview, but at least you have the opportunity to speak to someone and explain some of the details of your visa application