He was there a second ago, and now he's.... gone.

Just like that, Leo had disappeared. It was while you guys were saving Casey, you were too focused on getting him to the hospital before he bled out that you didn't notice Leo was missing until before you were taking Casey in the van.

Now, you've found him.... or.... haven't...

He's not himself. He's standing besides Shredder, as if he was sent from above, he even called him "Master"... he got brainwashed.

You all had to flee from there because it was nearly impossible to save Leo... or if he was still in there... the lair was tense and quiet without his presence, and everyone missed him. It hurt to see everyone so damaged after what happened.

So? In your despair to save your friends from such pain and Leo as well, you recklessly went to meet him to try to talk and get some sense into him.

Short answer: it didn't work and you're now tied to a chair as a hostage.

While Karai sent the message to Splinter and the other turtles of you being held hostage, Shredder assigned Leo to stay with you in case you tried to escape or if a rescue mission was planned.

Now here you are, with the guy who used to be Leo circling you like a hunter watching it's prey, not making a noise and just stated at you with a sharp gaze, and an unreadable expression.

Suddenly, he stopped in front of you and looked at you in the eyes. "You're the only one who hasn't lied to me, or so I believe. I do not wish to harm you (if I don't require to), so I'll make you an offering. Join me, join Master Shredder... join the Foot Clan, if you claim to be a friend." His voice wasn't as gentle as he usually sounded, his tone could be considered menacing or intimidating, but how he towered you took the take to look threatening.