The end of a wobble box

The camera vehicle appears to be travelling at 54 MPH and overtaking the lorry at a rate that suggests the lorry is possibly at 50 or less. So was the lorry driver looking in the mirror for a gap after the camera car to pull out (no indicator though) and then bang? I think we’ve all been in a similar situation without ending up being what we thought would be too close to the vehicle in front.