I thought MX-5 is a rear wheel drive car?? Anyway it is hard to
convince me that he is not speeding.
I own both Front/Rear wheel before, the fish tail thing wont happen
at such low speed (to you should be heavy traffic speed,
40-50maybe??) unless you pull your handbrake hard and change
direction at the same time. If too slow, with the handbrake thing,
you still wont fish tail the car.
If what you say is correct, the rear right hit the curb, the car
will not have a head on with the BMW lor. By the way, if the car
loose control, it will not go above the original speed, unless he
is going down slop, hitting anything will only reduce the
speed.
And I am even more suprise that a bystander that you found can
describe this detail to you. Not even reporter got to know what
happen!! Think you can be a very good reporter. Is he staring at
the road all the time?? I think this incident happens in split
second, even you are staring might not know how it happens.
But anyway what did happen already did, lets see whats the report
from the traffic police. No point speculating.
Or maybe this SpoonX and aloof_guy is same person 
