In-Universe:
The U.S.S. Defiant uses it's tractor beam to pull a Cardassian freighter to safety after being attacked by the Maquis.
Production:
A forward, ventral view of the filming model as the camera slowly passes underneath.
"The rolls and thrusters bursts Dax announced were brought to life by Gary Hutzel's crisp motion control photography of the Defiant and DS9."
— Cinefantastique Volume 29, Numbers 6/7 (Page 45)