Ignition occurs at 0 seconds; flames spread to ceiling at 7 seconds; tree is fully engulfed in flames at 25 seconds; furniture upholstery starts to melt at 30 seconds; sofa burns at 45 seconds; compartment transitions to flashover at 60 seconds; damage to compartment is consistent with flashover conditions as there is burn damage throughout the room from floor to ceiling at 1 minute and 25 seconds (end of video).