What if Robin stays Slade's apprentice? What if the Titans don't find the nano-bugs?
Robin is alone. No one can save him from the situation he's in. It's up to him to somehow make contact with the Titans, or better still... Batman.
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Slade watches Robin open the box and freeze at the sight of the mask. His eye narrows as he leans towards the central screen of his supercomputer. This test will determine just how close Robin has gotten to him, and how far he's come in his apprenticeship. Will he comply and wear the mask, or will he openly reject it? Slade will make no effort to encourage him towards it, he will merely watch and see.
He watches Robin put the box down... slowly... and sit at his desk, setting his elbows on the table and knitting his fingers together for his chin to rest on.
Good. He did not openly reject it.
Slade settles back in his command chair— or throne, as Robin calls it. He can tell the boy is conflicted now: his friends no longer trust him, he betrayed his own mentor, and now his new master has offered a truce. With or without his help, Robin is severing all of his ties and will eventually be left only with Slade. He's most likely already realized this.
Robin stays in that position for a long time, thinking. Slade smirks, because he knows Robin does this to keep him out. He cannot track the mind, after all.
He moves on to read some of the Batman's files. One of them is labelled "Superman". He opens it and finds several more files, the most interesting one reading "To do".
Inside that file is a list of all the kryptonite of Gotham City and its surrounding cities, which Batman undoubtedly plans on acquiring one way or another. One location catches his eye. He flicks a switch on the arm of his chair and speaks into the microphone: "Tell my H.I.V.E agents to rob Jump City's largest bank tomorrow night, try around 10 pm."
A low voice replies, "I'll make it a top priority, sir."
He sits back, content. This will make an excellent debut for Slade's Robin. He'll send him out tomorrow night.