»Why does Smith copy look scared of Smith/Oracle?«

When Smith takes over the oracle, one of the other Smiths looks petrified. Then Oracle/Smith does his 'yeahhaahahaha' demonic laugh. Why is one of the smiths freaked out?

i beleve he is suprised because, well you saw what happened to the room as he took the orical, all this stuff just started fyin around, so he wasent shure if it was a mistake to take the oricals shell, it might not have worked

hmm.. or could it be the Sati/Smith that is the one scared? Did anyone notice which smith it was?

I'm actually more interested in the end after Smith took over Neo and he backed up saying something like "Who are you?" in a whiny voice, why that? Did it have to do with Neo being the antivirus. Which I would also like to note, I believe he let Smith take him so the machines could inject the antivirus in him, is that why he was jiggled around when Smith took him over?