Magnetic reconnection and the outflow. 3D Rendering at three different times since the beginning of the avalanche: Δt = 0 s (lines approaching), Δt = 10 s (lines reconnecting), and Δt = 20 s (new lines detaching). Left column, top view, and cut at the middle plane: Two reconnecting magnetic field lines (marked by yellow and magenta lines among two bundles), reconnection sites (blue spots close to the centre of the plane), and velocity field (white arrows), which shows the collimated outflow departing from the reconnecting lines (see Movie 1). Right row: Same reconnecting lines from a front view (the coronal part of the loop is 50 Mm long; see Movie 2).