This summary is not the rule. The rule text controls.
If someone owes you money because of a court judgment, and you already tried to collect from a garnishee (like their employer or bank) once, you're not stuck if that didn't fully cover the debt. This rule lets you go after other garnishees later on if you think they now owe money to the person who owes you.
You can also go back to the same garnishee again if you have a good reason to believe they've since taken on new money or property that belongs to the debtor. To do this, you need to file a new affidavit each time, basically a sworn statement explaining why you believe this garnishee now has assets you can collect from.
In short, this rule gives you more than one shot at collecting what you're owed. As long as you have a real reason to believe someone else (or the same person again) holds money or property belonging to the debtor, you can start a new garnishment action against them.