At the beginning it's a difficult concept to put in our minds, as we can not see it, but very soon you understand that it's something with serious consequences.
I have found an interesting story that I found in internet on those days, in 2008 Mexico’s interior minister Juan Camilo Mourino was among the eight people on board a government-operated Bombardier Learjet 45 who died when it crashed into a street in the financial district when on approach to Mexico City’s international airport.
The crash, which started a severe fire, also claimed an unknown number of ground victims because it occurred in a busy thoroughfare.
At 18:42, when 2.7nm (5km) from the airport, the aircraft crashed as it was preparing to turn on to final approach for runway 05L. The pilots had just acknowledged a radio frequency change, but did not issue any distress call before the accident, but than Mexican investigators have disclosed that the Learjet was closed to within the minimum in-trail separation distance from a Mexicana Boeing 767-300 just before the accident, despite the pilots' being instructed to reduce speed, to maintain separation in the landing sequence to Mexico City, the Learjet continued to drift towards the preceding 767, and the pilots were suddenly forced to battle turbulence.
The executive jet failed to recover from the in-flight upset and crashed into a busy section of the capital city. Images from a ground surveillance camera, released by the Mexican transport ministry, clearly show the 767's lights as it flies overhead and turns to make its final approach to the airport. Shortly afterwards it briefly captures the Learjet diving towards the ground, at a nose-down pitch of 42°-46°, and the explosion on impact.
Here below you can see the video that shows first of all the Mexican B767 passing and turning left for the final of the Rwy, after few seconds you will see on the top right corner the Learjet on its nose-down pitch and the impact with the ground.