Epic fail

It could have been doing 30 at the time the guy pulled out but 40 by the time the lambo had time to start braking. Besides that street looks like 15-20mph was a safe speed with cars all around.

The other car pulled out slowly, surely the lambo could and should have stopped.

It is hard to say for sure but I am damn sure that

(1) The lambo was going too fast and / or accelerating too fast, even if they were under the speed limit
and
(2) The lambo did not try to stop ASAP, they tried to be clever and fucked right up.
but
(3) Maybe (only maybe) there is some contributory fault from the other car.

edit - most relevant thing - that lambo clearly is using a fair bit of throttle until about 6 ft from impact. Even if the lambo was driving safely (15-20mph) and there would have been a crash whatever he did (I doubt both of these things) had he slammed on the brakes hard and the moment he saw the guy pull out he might have only hit one car instead of three,

I was only trying to address the idea of a driver making an assumption about another vehicles speed rather than attempting to assess it - in this case assuming that a car is going within the speed limit. Can't really tell much about the rest of the incident seeing as you can't see the manner in which the lambo approaches, just what happens when it hits the other vehicle.