In-Universe:
After luring the Jem'Hadar into their trap the U.S.S. Defiant brings its pulse cannon phasers online, fires, and destroys the enemy ship.
Production:
From the motion of the model and style of the shot it looks like it could be the studio model but still --unsure--
Visual Effects Supervisor - David Takemura
Visual Effects Coordinator - Dexter Delara
