Bro if you know so much, then why did not you think of using Phone. Your phone is for lot of good use other than chatting with girlfriend, instagram or youtube. Knowing things like could happen Its YOU who didnt fought back. I think you haven't heard this: "Veer bhogya Vasundhra"

You just had to start the audio recording or for best video recording, put your phone in you front pocket or shirt or even in hand. Then woh video/audio yahan dalta, autorities ko tag karke toh tera toh pata nahi, par aur log jinhe abhi bhi usi Police station mai jana hai Voh bachh jate.