FYI Trident II is a intercontinental ballistic missile, it was not targeting AF1 as it doesn't have any guidance system to do that, it would have been targeting a ground/sea object. I think the cabin fire was 1AM so hours before the sub launch.
Have not seen anything on this, could it have been a missile fired from a destroyer? this cruise missile launch looks similar, don't know when it goes horizontal and the wings pop out.