When the Titans found her, she was alone.
Slade's layer had not changed much from their last encounter, and his contract with Trigon only made his layer darker.
He had over done himself, the Titans had to admit. The amount of robotic minions and the assistance of the Hive Five were certainly more than Robin had strategized for. While Robin had expected much from Slade, and while he felt he could infer what Slade's motives and actions could be, he had never fathomed this. He had no idea Slade would kidnap Raven again, and he had no idea why he wanted to.
It was strange; Raven was not an easy target. With her powers alone, he would have had more luck with almost anyone else on the team, Robin included. Although Robin could admit why Slade may have chosen Raven; perhaps Slade wanted the powers Trigon had contracted him back, or perhaps it was just a ploy to put the team on edge.
But all of the detective skills in the world couldn't have helped Robin come to this conclusion.
Robin rushed to her side on the concrete floor to examine her. She was unconscious, blood dripping from the side of her head and from the lacerations on her naked body. Cyborg and Beastboy turned their eyes away, unwilling to violate their friend with their gaze. Starfire stiffened her lip to try and hold back tears. Robin struggled to make a log in his head. She was going to need stitches, and possibly ice to avoid black eyes from her broken nose…
Then Robin noticed the blood caked between her thighs. He tried to deny it to himself, to say that Slade was evil, but he couldn't have possibly been so cruel. Robin removed his cape and wrapped it around her, attempting to spare the other Titans from this resolution until absolutely necessary. Although he knew it was pointless to try, he didn't want any of them to feel what he was feeling.
Anger. Agony. Fear for their friend.
Robin's heartfelt shredded, and the only way he could cope without releasing his anger was to call out orders. He called Cyborg over and asked him to lift their unconscious friend and carry her to the hospital. He instructed Starfire to go back to the tower and retrieve clothing to replace Raven's destroyed ones. He then instructed Beastboy to aid Cyborg in delivering Raven safely. As much as Robin wanted to go after Slade, and as close as he was to taking off after him, it was not the time to make the situation about himself and his need for revenge. It was time to focus on Raven and getting her the help she needed.