Wood with charcoal on top will indeed burn like that. Note, as another commenter mentioned, the black charcoal stain to the left on the pavement.

Someone had to have placed charcoal or perhaps just plain sticks or whatever on top of the table to start a fire. Noting the light circular ring around the burn area, that suggests the flame was covered by a circular object, such as a pot or pan, and the heat traveled outwards in a circular manner rather than upwards.