The context of the following conversation is Carson kept Tracy alive by giving Tracy CPR and performing mouth to mouth resuscitation on them.:
Tracy says Oh my goodness I had a life and death moment today..
The friend responds What happened are you okay you're shaking..
Tracy responds I am now I don't know what I would have done with Carson..
The friend responds So please tell me what happened what did Carson do?.
Tracy responds I went swimming in the lack and had been down there for more time than I should of.  Carson saw me and pulled me out and performed CPR..
The friend responds Wow, if he hadn't been there it would have been terrible for you!.