If you have assigned the individual to the wrong manager, it is possible to unassign them very quickly.
1) Select the user until it highlights in blue.
2) Click "Assign" above the user list.
3) The following message will pop up. Click "Unassign".
4) Click "Unassign" again to confirm.
The user has been unassigned. To learn more about how to manage an incident, please click here.