How Did Chris Brown Leave Scene So Fast?

One of the big questions surrounding the alleged altercation Sunday night between Chris Brown and Rihanna was how did Brown get away from the scene so quickly?

RadarOnline.com has learned exclusively that after Rihanna threw the keys of the rented Lamborghini on the sidewalk/grass, Chris exited the vehicle and was whisked away by his security detail that follows the R&B singer at all times.

A well placed source tells RadarOnLine.com "The security detail usually drives Chris, but he was driving the Lamborghini that night for the Grammy's. The security team was following him in an SUV and quickly got Chris out of there."

RadarOnline.com has also learned that Rihanna is currently in Barbados, and Chris is back in the Los Angeles area holed up with his mother.