The only worn off messages you should see are for your own detrimental spells, and only when the npc is alive.
Example: your mesmerize spell has worn off!
The earliest I see anything about this was giving players an option to use a different color for their own messages, prior to Velious coming out.
Quote:
August 2000
29 - Spell worn off
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Next was
Quote:
9/26/2002
The "Your XXX Spell Has Worn Off" messages for DoT spells will now go to the right character.
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references:
http://www.tski.co.jp/baldio/patch/20000823.html
http://www.tski.co.jp/baldio/patch/20020926.html