The Vulcan is an armored unit containing and orbital cannon inside an indestructible metal shell.
In order to attack it opens the shell, extends the cannon, and performs a high intensity laser shot to the sky. A few seconds later, it falls to the floor around you decomposed in several low intensity ones.

Tips
-After the vulcan shot to the sky, the IA in your armored neo suit will mark on the floor the expected impact points to help you avoiding the fall.
-When the Vulcan extend its cannon you can shoot this point to destroy it easily.
-The Vulcan shell can't be destroyed but its energy core is placed on its bottom. Shoot this point even if the shell is closed to destroy the Vulcan and get a coreshot bonus.