And we'd passed the first junction in the tram lines, so I wasn't sure that just catching a tram back in the opposite direction would even take us back to the airport.
At this point, I realised we were in a real mess.
And then, logic came to my rescue. If the passport was still back on the plane, then there was no way I could have cleared immigration. And if I couldn't have cleared immigration, then ipso facto, I couldn't be where I was. Therefore, this was a dream, and I could wake up, please?
So I did.