A Grave Disturbance Chapter 2, Part 16

Vader still clings to life, using the Force to force air into his shattered lungs. It takes all of his willpower to do so . He also uses the Force to call out to the minds of his Stormtrooper escorts who have been dutifully waiting outside during the entire battle, commanding them to enter and come to his aid.

 

Stormtrooper: Lord Vader!

Done