This is a translated transcription of the NOS hostage-taking video, that can be found at https://www.youtube.com/watch?v=2Dy1o23hRZM (and in many other places, by now).

Transcription and translation by @joepie91 (Sven Slootweg, http://cryto.net/~joepie91), free to reuse and redistribute under WTFPL/CC0 (ie. no restrictions or requirements whatsoever, effectively public domain).

HT = Hostage Taker
S = Security guard (the 'hostage', presumably)
P = Police officer(s)

HT: Well, you're staying calm, that's pretty cool...
S: I'm just as nervous as you are...
HT: Yeah...
S: But I also just want to go home.
HT: Yeah, I understand that.
S: So I'm not going to get in your way...
HT: I understand.
S: ... with the risk... yeah?
HT: Yeah.
S: And I'm happy that you also want me to go home tonight, we have to make sure that, well... I mean, this is done with a reason.
HT: Of course, yeah... I hope that you... Well, could you sit over there then, in a bit, when I start? [pause] I promise nothing will happen to you, but you see, if I'm in here on my own... they're probably already standing outside. They might as well... the things that are going to be said here, those are very big topics. I mean, we've been hired by intelligence agencies, and there we've seen things that cast a shadow of doubt over our current society, and that's what we'll be publicizing here. So that's why I already said, we're not really such bad people. We're also doing it for the average citizen. But that's why it's possible that the people 'up there' tell whoever's standing outside to "well, just kill him, because nobody should hear about this". And if I'm here on my own, there's a pretty good chance that they think "well, we'll just storm in and shoot holes in him".
S: Right. I guess... I assume that the director... And well, I really hope that you won't... if I'm sitting there...
HT: I promise, we can shake hands on that...
S: ... that you don't, in the process, take me with you.
HT: No, no, definitely not. But I'd like it if you... well, if you stay here, there's a much smaller chance that they'd undertake such an action.
S: Right, like that.
HT: Yeah. Aside from that, when my speech is done, you're free to go.
S: Okay, but when your speech is done, I assume you'd come outside with me...
HT: Well, I might just let them arrest me here or something... We'll see...
S: Okay, but...
HT: Then I'll let you outside, you can just go outside. But, I think this is taking too long.
S: [to 'director'] "Can you hear me?" Well, the mic is live.
HT: Yeah, but isn't there any contact with... [pause] Yeah, I don't like how long this is taking.
S: "Anybody... director?" Well, you've heard it, just like me...
HT: Yeah.
S: ... the microphone is working.
HT: Yeah, the microphone is working, but I need to know that we're on live television. And I also haven't heard anything yet from... [fiddles with 'comms']
S: But well... you said, you can only hear them.
HT: Yeah.
S: They can't hear you.
HT: Yeah.
S: You know? Because you're standing here now, with a microphone, and a camera, and it's lighting up red, so you're in the image, and that's the image that's being sent out.
HT: Yeah, but how do I know that this is also on television?
S: Yeah, exactly. You know? That's what you need to hear from those other people, they can't...
HT: Yeah, but just now I heard "microphone is working" or something like that- ah, there's the police already. And they're going to...
S: I really hope that... can I go outside?
HT: In a bit, yes, when the speech is done. [pause] He has- [now shouting] What are you going to do?
[voices in the distance, door opens]
P: Police, drop your weapon! Drop it! Drop it!
HT: Yes, yes, I've dropped it.
P: Get on your knees! Keep calm! Stay calm! Keep your arms free! Any suspicious movement and we'll shoot immediately, do you understand?
HT: Yes...
P: Okay, contact control center, situation is under control. One suspect arrested.