For some reason he decided to add LOTS of vibration to his voice so he could (again, I don't get why) sustain the last note in each sentence longer. Maybe he forgot he didn't hold these notes for so long in the studio version and got it mixed up when he practiced. Maybe he had an off night and he tried to overcompensate by holding notes (which he couldn't handle without vibrating?).
Overall though, this DVD is just not so good for many reasons, and James is the highlight of it. I'm not saying he was bad in these shows, but in relation to a few other shows he was just weaker; and overall, the sound effects on his voice are just bad throughout the whole tour.
There are some versions of Lines in the Sand from the same tour where he sounds so much more intact and even nails a few high notes. IAW's 15th anniversary fanclub release features miles better versions of both TTT and Surrounded, not considering the fact that in said performance they played the complete version of Take the Time, not the abridged one. The Dark Eternal Night was not just annoying to listen to, but also it's probably one of the worst versions of it in the entire tour, and I'm so glad that we get a new version of it in Live at Luna Park. And I'm even happier that he sang it so beautifully in Luna that it'd take some absolutely horrible editing skills to ruin that version.
James was extremely good in that tour, maybe better than the 20th anniversary "Evening With" tour sometimes. But this specific package of material presented to us as the "Chaos in Motion DVD" gives clueless Youtube users a legitimate reason to come up with theories about another vocal rupture. He was great in that tour and he was even okay in the shows on the DVD but the actual product shows otherwise, for all the wrong reasons, it's absolutely not his fault. And as a huge fan of vocals, and JLB's in particular, it really ticks me off.
It shouldn't have happened right after Score, where even his haters began to appreciate him.