I've seen the weirdest things (but then again, I'm old), including a guy that got a premium per knife fuse replaced (because they're known to occasionally spew fire upon re-insertion). There isn't much context here but between complacency and tiredness there are plenty of ways already in which this could have gone wrong, but outside factors such as pressure (this is Asia, after all) may well have been part of it.

And before anybody sees that 'Asia' comment as somehow politically incorrect: the statistics are pretty damning, Asian operators abroad have less than stellar safety records and very high pressure on industrial workers to meet their (sometimes unrealistically high) quotas and I would not expect them to do any better in their home countries.