We are watching the positive leader end of a horizontal intracloud discharge. The silhouette at the bottom is of the flats in my neighborhood. The positive leaders are very weakly luminous channels, surrounded by recoil leaders which connect and run through these channels.
At some point, continuing current occurs in one branch, likely caused by developments (e.g. a cloud-to-ground channel) somewhere out of view at the negative leader end, and it triggers a series of small recoil leaders circling around this branch.
This discharge occurred during the passage of a small mesoscale convective system over northeastern Spain, under the stratiform precipitation area.