The kill ...statusonly command reports on the progress of a server process ID (spid) in rollback status, but does not terminate the spid.
The statusonly report displays:
kill spid with statusonly
Where spid is the number of the process you are terminating.
kill 13 with statusonly
spid: 13 Transaction rollback in progress. Estimated rollback completion: 17% Estimated time left: 13 seconds
Status report cannot be obtained. KILL spid:nn is not in progress.