Captain: There are few times where one must flex his authority instead of being kind and understanding

Now is one of those times.

Captain: I've made my choice.
Captain: Turn over the nuclear authentication disk, and give some protection to ResearchDirector and HeadOfPersonnel while they get as much off the station as we can before it's destroyed.
HeadOfSecurity: You're the only other one here who knows how bad this is gonna be.
Captain: I'm calling the emergency evacuation shuttle.
HeadOfSecurity: You can't do this.
Captain: You have authority over the security department, not stationwide executive decisions, son.
HeadOfSecurity: I thought I could count on you, you piece of shit.
Captain: I know this is a mighty heated moment, so I'm not gonna hold that rudeness against you.
Captain: Just follow your orders.

HeadOfSecurity: Don't follow your orders.