Disclaimer: I don't own Teen Titans
3. Raven literally cannot hurt any of the other Titans
Raven's magic was a curious thing. Created from an extraordinary combination of genetics and destiny, it served two purposes: to give her the power to become the portal and to keep her alive long enough to become said portal. One part gave her incredible abilities, the other gave her an internal watch dog. These things had been explained to her at a young age, so that when she began her training to control these emotion-driven powers, there wouldn't be any surprises.
There were surprises anyway.
Her training was supposed to keep her emotions sealed away, brought out only when survival necessitated them. None of her instructors predicted that Raven would develop any emotional attachments to anyone. Her eventual love for the Titans was not factored into this training, and as such, that love acted in ways unforeseen.
Among one of her abilities, often enacted involuntarily by her watch dog, was healing. Paper cuts were healed instantly, bones could reset themselves, and diseases were chased away before they could take root. If she wasn't destined to die for a purpose, she could have easily lived forever.
The watch dog, however would sometimes mistake one of the other Titans for Raven. When desperation, pain, or fear clawed at her restraint because one of her teammates had been hurt, her healing would temporarily jump ship.
They were all a part of her now. Extra, emotionally linked limbs, essential to keeping the portal full and operational. One time Starfire took a bullet in the middle of a fight and Raven, who had been fending off Mumbo, found herself suddenly transported to Starfire's side with her glowing hands pressed against Starfire's bleeding stomach.
However, the primary function of the watch dog wasn't defending Raven from outside forces. First and foremost, the watch dog defended Raven from inside forces.
Self-harm was not an option, suicide wasn't even a word in the metaphorical vocabulary of Raven's magic. The portal could not be allowed to damage itself and ruin the entire operation before it could begin. Yet again, Raven's emotions found a loop-hole.
Her magic could easily manipulate her friends, but cause them no harm. For instance, whenever she tossed Beast Boy out of a window, just before he hit the water, the velocity would somehow slow down and ease him into the bay. Raven could no more hurt her friends than she could hurt herself.
The most unexpected surprise came the day of the prophecy. What was supposed to be the end of the world, the end of Raven, despite all the planning, all of the fail-safes set in place to assure its success; failed. Raven lived.
Why? She arrived, full and operational, and she brought Trigon forth. The destiny that had been as inscribed in her as her genes had been fulfilled. The only thing unaccounted for were the Titans. They lived, they breathed, infused with a part of Raven's powers. While Raven perished; Raven's watch dog lived on in her emotional limbs and essentially realized:
Shit, I have to fix this; she's dying and not all at once like she's supposed to… It must not be time yet.
So, she was brought back from death. All because the rules and bounds of her magic were subdued by the one thing no one took into account: that she was capable of connection, of love.