I thought that was a particle shield for during battle. If thats what it is it would fry anything, lasers, missiles, people, ships... I'm fairly sure the rebel and imperial ships both use magnetic fields to keep air in, not shields, and there is nothing to stop people from going out unless the durasteel assault doors were closed. As far as i know there are two types of shields, Energy shields that stop only lasers, ion bolts and the like, and particle shields that stop everything including air, but if you open a particle shield to let vehicles out and have no magnetic field the air gets out too. there is no shield that can stop people, but let ships out because they are both made of particles. Proof that a particle shield will destroy ships is in episode VI when the rebels attack the second death star "The shield is still up. Take Evasive action! All crafts pull up! or down!"