Disaster or a midnight lullaby (TMNT Leo fanfic)

Ever since my brothers and I beat the Shredder I've been having these nightmares and even when I meditate.I can't tell whether I should or shouldn't tell my brothers or not.But another thing is that Master Splinter has been acting extremely weird,I mean he's been wanting us to practice horrible Katas. The forbidden katas. And Donnie is getting the strange feeling that our Sensi isn't our normal sensi.

Plus Karia is not talking much or trying to kill me and my brothers.Something must be wrong but I can't understand what to do or who to go to for advice.

"Leonardo!!!!Get down here right now and practice your Katas or you will be punished!"

"I sensi,"I raced into the dojo but what I saw horrified me. Mikey,Donnie,and Raph were on the floor out cold while Master Splinter was walking calmly around them.

"What have you done Sensi?!?"I quickly checked if they had a pulse.'Stay with me guys.I will make sure that you're never harmed by him again.'

"Hmm.You know Leonardo that they are nothing compared to your skills.....Too bad I have to do the same to you but I have one last request,join me and your brothers lives will be spared if you don't, well don't be surprised if they wined up dead at your feet,"His voice sounded nothing but dark and as deadly as the Shredder himself.

"I will never join you!You're nothing but a coward! If I was the one you were after you would have attacked me not take it out on my family.COWARD!"I just sat the others against the sewer walls.When I turned around all I felt was his first hitting me in a fiery.The next thing I knew was I ached all over and I could feel blood running down the left side of my face.Laying next to my right hand blue fabric was ripped in three places near my left eye.

"Easy Leo.Dang I thought that wound was gonna heal correctly,sorry Leo guess it's going to leave a nasty scar,"Donnie began messing with my left eye,I tried not to wince but it hurt.

"Man the next time I see that jerk of a Sensi I'm gonna bet the shell out of him!"Raph's voice came from the outside of the dojo.

"Why why did he attack us?"Mikey weakly said from the cornor of the dojo with his arms crossed.

"I don't know Mikey but we're going to find out I promise you guys.When are you guys going to be ready to fight again?"I struggled to sit up but what made me feel so enraged was the attack itself.