The user you are about to revert has at least 50 article edits. Many editors of Wikipedia suggest not "templating the regulars".
You will now be returned to the STiki window to re-inspect the edit. Whichever option you choose this time will be applied as normal.
If the edit is truly unconstructive, revert it. However, wiki-etiquette indicates that a polite and personalized user talk page message is preferred over standardized warning templates for such users.
Alternatively, if the situation is ambiguous you should consider leaving an article talk page message.