On a light trigger gun, its very easy to rack/shoot by mistake. The slide bangs the gun forward, sort of the opposite of recoil, and if your finger is on the trigger, guess what happens (been there, done that..), if your grip is not very very solid it will go off. I dunno about the AT, but that *seems* less likely as the trigger is not that light. Still, its also easy to squeeze it while trying to grip it.
If you are in any doubt, rack the slide with it pointed down range on live ammo, with your finger away from the trigger. Convince yourself that the gun does not fire from slide release, or, if it does, get it serviced (no matter that you should be safe when racking the slide, if it fires due to a slide rack it is a malfunction, and can lead to full automatic fire, or doubles, or other such problems, not to mention rack-shoot by mistake wastes ammo and can be dangerous if you let down your guard).
I just do not see how a DAO gun can fire this way, however. It is a posible issue on a gun where the hammer is supposed to stay back after slide rack, if the hammer slips (malfunction) it can happen. But a DAO gun, the slide would have to hit hard enough to cause inertia to slam the firing pin into the ammo primer or something odd (and nearly impossible).