Looks like a missle but where did it come down at?
Depending on staging, the missile (one stage) simply stops emitting gasses and coasts down into the middle of the Pacific. Falling objects from 150,000 ft or under don't “fireball” like breaking up Space Shuttles do. A single upper stage that is fuel and engine parts breaks up and sin’t likely to be seen over the mid-Pacific.
A re-entry capsule or bomb casing - IF (big IF there!!!) isn't easay to see, and isn't even really necessary. The purpose, you see, would be for some foreign power to show off the LAUNCH of their missile from near the US coast, not to actually land a capsule or bomb anywhere in particular.
Right?
I answered this in a previous post - but that too is sheer speculation.