A learner is about to make a manoeuvre that would create immediate danger, unlike a minor technical error. What should the ADI do?

1. Intervene immediately, using verbal instruction or dual controls if necessary, to prevent the danger
2. Wait until the manoeuvre is finished, then discuss it in the debrief as with any other fault
3. Allow the danger to occur so the learner learns from natural consequences
4. Say nothing, but note it for a report to the DVDL later