BS!!! When you are fighting for your life, you do anything/everything to call 911! To get help from someone!!!
My mama always told me (may she rest in peace) that if I ever was in a life or death situation (mugging/rape/beating) to throw up on them. She said "think about it - it will come naturally". Thankfully, I've never had to use that advice, but it sticks to me to this day. This leaves your DNA on the person and they will most likely not want to continue (or they'll kill you -- but it's a chance I'm willing to take).
1. Throw up on the perp.
2. Call 911
Mel