If your user (who is redirecting) were one of the destination users then one easy solution would be to have the manager - not redirect - but release the item and have the desired user allocate the item to themselves (by clicking on the item in their worklist) This will mean the manager should still be able to see it.

Something a little more involved, but that would give you more control, would be to work the redirection action into the actual process. If you expect the manager to view the subordinate's worklists and assign them their tasks - then you would create a "review" activity that has a form associated with it to allow the manager to "assign" the item to someone. then the assigning action would move the process to the next activity - which would then have the user intended to have the item as it's destination user. You could insert a sql data event to capture this info into an external database table - and then report on that table.

You should take a look at the kb21 for information on reporting. You can use the filterservice webservice to get anything that you can see in the workspace reports area.

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