So when the Big Bus passed behind the park, it means the other side...
The travel guide, a woman, saw a couple in a particular moment: A man did a marriage proposal to a woman.
On exactly moment that the bus passed... She (the travel guide) stopped the bus, called the couple to bring more close to the bus.
Se the video about that amazing moment. This video is about that moment.
You will hear guys speaking in portuguese, but the mains history are in english.
See that!