No worries what you wrote is clear and the black box log is pretty hilarious
. Was imaging it as watching you take off a little wobbly at first then start flying forward for a bit and then all of a sudden it tumbles
sorry to laugh at it but was a bit comical to watch and play out in my head/on screen.
Anyhow to me it looks like the back left motor either got disconnected or otherwise blocked (wasn't producing thrust but was trying to go full throttle on that motor to recover from the tumbling most likely).