About the internal effects of releasing that much weight that quickly from a bomber: during Linebacker 1 I was on a B-52D that EARed (Emergency Armed Release) about 60,000 pounds of bombs more-or-less instantaneously. There was definitely a lurch upward (the pilot later said around 1000 ft), but the real attention-getter was a loud "bong!" from the airframe as a lot of stresses suddenly rearranged themselves.
When it happens, you know it.