Ok you've all made me go and watch it again (with subtitles)! It goes like this:
Human Nature is playing over final credits and stops abruptly at 'Looking out...(bam)'
Cut to MJ on stage.
MJ: There should be a break there.
KO: Yeah, we gotta work that out.
MJ: Have it right there okay?
KO: Yeah, we gotta work that one out (subtitles say this, but I only hear mumbling!)
MJ: Let me bathe in my own time when I come back in.
KO: Yeah, you got it.
MJ: I'm gonna button my shirt or my jacket or whatever it is. (KO mumbling something about 'come back in' over this bit)
MJ: I'm gonna look around a little bit, play with them. Snap my fingers maybe, then bam!
Cut to Earth Girl.
In the Human Nature section of the film (which incidentally I found one of the most odd in the film) it has this pause too after 'looking out...', but he just waits a few seconds before singing '.... across the morning'. No buttoning his shirt, looking round, playing or snapping fingers here! Interesting that they save that bit for the very end when most people won't see it.
Also there is no music till after he's sung '... across the morning', so my theory that the pointing bam pose was a cue for music, is rubbish! The musicians would simply use him singing again as their cue.
DancingTheDream, what makes you think this was a rehearsal for Billie Jean rather than Human Nature?