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Not only can SB *not* raise (he'd be raising himself), but NO ONE can raise. Everyone else can either call or fold.

edit: kerduh on me, explanation is appropriate even though it's already been said.

If it's not a legal raise then the partial raise closes all action. This is in effect on all streets.

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NO! NO! NO! NO!

The partial reraise does not close the betting to the players who had not yet acted on the SBs raise.

The partial raise does not reopen betting to a player who has already acted on the last bet or raise, but it does not close the betting to a player who has not yet acted on the last full bet or raise.