It is my honest belief and opinion MR had already killed Tori before he pulled her from the car. I hate to be so graphic but the fact that Tori was bleeding due to the sexual assault inflicted by MR, and the pain Tori would have endured would cause this sweet baby to go into shock. Shock can cause death if medical intervention is not sought or treated properly. Along with the shock Tori was bleeding internally. These two factors alone would certainly cause death.
So even if the hammer wasn't swung, the inevitable truth is Tori would have died anyhow all because of what MR did to her in his car. He is the one guilty moreso of murder in MHO. If they would have drove off without using the hammer and just left her under the pine trees, (if she wasn't already deceased) she would have slowly and painfully died. Going back to Tori's motionless body on the ground. Why would MR throw Tori outside the car, on the ground? JMHO is because he was "done" with her, she was dead or near death. He wasn't getting any reaction from her anymore, the screaming, fighting, crying out in pain and therefore he wasn't being "turned on".
If TLM was in a rage as she stated, she certainly would not have taken the time to cover Tori's head in garbage bags, this seems far fetched. Someone acting in a rage does not rationalize that way. All my theory and my honest opinion. MR is a <modsnip> and sought out TLM the loser ow life who he knew he could manipulate to go along with his perverse plans. As per TLM claim, as to what MR said to her,
"you would do anything for a little bit of love eh":moo:
Understanding Shock.
Shock is a life-threatening medical condition and is a medical emergency. If shock is suspected call 911 or get to an emergency department immediately.
http://www.medicinenet.com/shock/article.htm#facts
When does hemorrhagic shock result in death?
http://www.sharecare.com/question/when-hemorrhagic-shock-result-death