Results of the cloud and slab modeling for the collapse of the fan-shaped jet. a: observed total mass of jet over time (blue). Simulated fan collapse based on second time frame assuming acceleration under gravity (red). b: delivered momentum to solar surface over time. c: Ca II 8542 Å STiC inversion of flare background (gray dashed), obtained from observed profile (gray). Ca II 8542 Å fan profile (black) fitted from background profile with an absorbing slab above it.