https://2e.aonprd.com/Search.aspx?q=disrupt&include-actions=Reaction&display=short

Reading through some other examples, it’s definitely a mixed bag of wording, with some saying “attempts” or “begins” or otherwise implying before the action is complete, and some saying after.

I’ll stand by my original claim that the correction should be “attempts to Stand” though, because reactions occur after the trigger is complete, you can’t disrupt an action after it’s happened.