The pilot in the fighter guided the unmanned flying bomb to the release point and then separated.
In addition, the pilot of the “parasite” fighter had a tv screen and something akin to a joystick to guide the unmanned flying bomb to its target.
The angle between the craft was developed by one of the Third Reich scientists who got paperclipped after the war; his angle was obtained by NASA for its design work, and used for the Space Shuttle.