Trident tests out of Port Canaveral off Florida coast all the time. Not unheard of, and we are able to point these things where we want them to go. The corkscrew smoke trail leads one to think it is a test launch, being slowed up so it stays in the range for the test and doesn’t keep going say to Polyarny.
Thats where Husband’s boat did their Certification test after sea trials.