Page Split Timing

Question

So, imagine I have a page that I intend to cause to split.

 
USE master ;
GO

IF DATABASEPROPERTYEX (N'Pages', N'Version') > 0
BEGIN
    ALTER DATABASE Pages SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
    DROP DATABASE Pages ;
END
GO

CREATE DATABASE Pages ;
GO

IF EXISTS(SELECT object_id FROM sys.objects WHERE name = 'PageSplit')
BEGIN
    DROP TABLE PageSplit ;
END


USE Pages ;
GO

CREATE TABLE PageSplit
(
      c1 INT IDENTITY
    , c2 VARCHAR(2000) DEFAULT REPLICATE('b' , 1000)
) ;
GO

CREATE UNIQUE CLUSTERED INDEX CIX_c1
ON dbo.PageSplit
(
    [c1] ASC
) ;
GO

INSERT INTO PageSplit DEFAULT VALUES ;
GO 7

DBCC IND(Pages,PageSplit,-1) ;
GO
DBCC TRACEON(3604) ;
GO
DBCC PAGE (Pages,1,231,3) ;
GO
-- m_freeCnt = 977 

At this point, I need only update a row like so and I get a split: 3 rows to one page, 4 to the other:

UPDATE PageSplit 
SET c2 = REPLICATE('b' , 2000)
WHERE c1 = 1 ;
GO

So, my question is this: when does the update happen: before or after the page split? I assume that it occurs after the split.

I have attached the output of SQL Profiler and DBCC IND. Just a side note, the updated row remained on the original page.

I applied SQL Kiwi's advice. See the results here: