How do I select the extent of text to gettext when using AISense on passive text?

I'm using AISense to retrieve a status message from a web-based terminal emulator. I've set the anchor and selected 'passive text' as the type, then dragged a select box around the entire sentence ("no data set namess found"), and saved the gettext result to a variable. When I display the variable contents with an alert box, I only get the last word in the sentence (this is also the only word hilighted in the preview screenshot when I look at the action).

How can I alter the parameters of the AISense action to retrieve the entire sentence and not just one word? If I choose the 'recapture object' option, I'm presented with the standard object recorder (which doesn't work, as it doesn't recognize the non-clickable status text as a selectable object).