RIDDLE! ->

I lie between the open blue abysse and the devils grasping clutches
I am free yet i am a prisoner.
I talk like you
I can breathe like you
I can't walk like you.
I look like you.
I enyvy you.
I can breath like you but if you breathed with me your little heart will stop.
I breath like you,
I don't look like you,
I talk like you,
you hunt for me.
what am i?






*so im going to watch SPN when the next break comes i will check on you guys.
The one who gets it right will ghet 100kmp!