i know it's best to use the slow syncro flash when we wanna take photos against a brightly lit background at night, but how does it really work? is the main subject (ie. my friends) taken with a quicker shutter speed while the background is captured on the 2nd flash with a slower shutter speed? If that's the case then it's still possible to handhold the camera and take the picture right? The main subject will be sharp, but the background may be slightly blurred right? Or am i wrong?