*Spoilers, really this is about the ending*
 
*I warned you*
 
 
 
 So,I need some explanation. How did Isaac destroy the marker? I mean one minute it's there and after the Nicole fight it vanished. Did he destroy it with his mind? Is Isaac a telapath now? I loved the game but I really was expecting cutscene of some sort where he touches the marker and it blows up or something. Maybe I wasn't paying much attention? I don't know, any help is appreciated. 
 
 
 Also, I was talking to someone right before that stick a needle in your sequence, what was that all about? It was powerful either way. 
 
 
Thanks in advance.

It destroyed its self. The marker is alive I think. And the pulsing thing is what was powering it. So when he destroyed the link he destroyed the marker.  
 
The needle goes into the eye and gets the point in the brain where the first marker stored its info in his head. They used that info to make the big ass one. 

What the laughing man said. Also a cutscene, in deadspace??? Boy are you crazy!!!!

Dead Space 2 gives you plenty of questions about everything related to the Marker and Necromorphs. The truth is that there's practically no evidence how any of this works. All you have is speculation. Your guess is as good as mine, and there's probably plenty of evidence to back it up. We just don't know.
 
But since we're here talking about it, I would guess that the needle procedure and Isaac's close involvement with building the thing caused the Marker to self-destruct after he rejected Haluci-Nicole in his mind. The Marker can screw with people's heads... and I would guess that it's a two way street. People who know how this all works (like Isaac) could probably influence the Marker like the Marker influences people. Whatever the Eye Poke Machine does... that probably has something to do with it too. Not to mention Isaac was all "fuck your marker!" in the middle of Convergence. Anythings possible really.

" Dead Space 2 gives you plenty of questions about everything related to the Marker and Necromorphs. The truth is that there's practically no evidence how any of this works. All you have is speculation. Your guess is as good as mine, and there's probably plenty of evidence to back it up. We just don't know. But since we're here talking about it, I would guess that the needle procedure and Isaac's close involvement with building the thing caused the Marker to self-destruct after he rejected Haluci-Nicole in his mind. The Marker can screw with people's heads... and I would guess that it's a two way street. People who know how this all works (like Isaac) could probably influence the Marker like the Marker influences people. Whatever the Eye Poke Machine does... that probably has something to do with it too. Not to mention Isaac was all "fuck your marker!" in the middle of Convergence. Anythings possible really. "

I think that whole bit with Nicole wasn't entirely in his mind, I think that whole sequence was a big hallucination.  The boss arena was about the same size, if I recall correctly, as the platform Isaac's standing on and when you shoot at the heart thing its in the general direction of the marker. So while he is struggling with his inner demons he is still moving around the platform in front of the marker and shooting at it to destroy it. The heart or whatever is just the marker itself and the hallucination and Nicole-Boss was there to try and protect the marker from Isaac by causing the strong hallucination.
 
Thats just my theory, although the red marker could only be destroyed by dropping a fucking planet onto it so yeah I'm probably wrong. 
 
Or that whole sequence was just Isaac breaking out of the hold the marker has on him and the marker was destroyed when the sprawl blew up. Why did it blow up? I dunno I've played it through twice but I can't remember the cause but if it wasn't already explained I'll bet Gabe and Lexine are the ones who blow up the place in the DLC. 
 
Yeah, thats a much better explanation.

Isaac used his mind to fuck everything up. He's a bad ass version of future iron man that's all you have to know. Also, in that universe, chicks are or evil or dead, or only have one eye and are pissed off.

I'm still wondering why he wasn't more pissed that he lost his eye.

" I'm still wondering why he wasn't more pissed that he lost his eye. "

" @JoyfullOFrockets said:

" I'm still wondering why he wasn't more pissed that he lost his eye. "

He did not lose his eye.  "

" @The_Laughing_Man said:

" @JoyfullOFrockets said:

" I'm still wondering why he wasn't more pissed that he lost his eye. "

He did not lose his eye.  "

Hmm, I'm pretty sure I saw that poking thing coompletely fucking up his right eye. Then again it was 2 AM so maybe I was too tired to pay attention. "

" @JoyfullOFrockets: It was a clean in and out. Well, not entirely clean, he bled a little, but no lasting damage. "