Because in Twilight, the thing that happened with James: the head hitting, the blood loss, the venom??!
New Moon: when she fell off the motor cycle, her birthday 'extavaganza', she should have broken some of her bones atleast, not a bloody, and then the cliff jumping, when the wave pulled her under the water and hitting her head, under the water for like 10 minutes should of made her drown!
Not meant to offend any one, just have you noticed?