One of the world's most celebrated photographers called it the decisive moment -- the simultaneous recognition, in a fraction of a second, of the significance of an event as well as the precise organization of forms which gives that event its proper expression. -- Henri Cartier-Bresson.

It is debatable whether a moment captured during the Vancouver's hockey riots can be called decisive, but it's thrown up a lot of questions -- who is the couple and what are they doing.

Lying in the street and seemingly locked in a kiss as chaos erupts around them, a young couple appear oblivious to the charging crowds and baton-wielding riot police.

The photograph, taken amid Vancouver's hockey riots, has been tweeted around the world. But the photographer who took it is still not sure what the picture really shows.

Read the report in the Guardian.