I work in the same city I did my CBT in, was going across a roundabout, about 15 feet past it is a junction.
Recognised the instructors bike and he had a learner with him, learner stalled, then stalled again (this was at like 6pm so I'm assuming the instructor was desperate to finish) i saw the instructor shake his head.
I cross the roundabout and stop as no one was behind me, wave to let the learner go, he correctly double checks no one is overtaking me and then stalls, he gets it the next time and goes, instructor goes to follow and stalls too, he looks right at me, lifts a finger to the helmet where his mouth is, the universal shh sign and then rode off after the learner š