I was there about 5 minutes after it happened last night. The RJ pushed back, stopped, unhoooked. Sounded like the 757 was pushing back a bit later. Boom. Actually after talking to the skywest pilot's compared it the feeling of turbulence.
To raise questions about overall airport safety is a joke and totally blown out of proportion. And to include runway incursions with a story on a pushback incursion totally takes what actually happened out of context.