Bella can see Jasper’s scars (and other identifying features) from quite a long way away. She can see his eye color from an even longer way away. Exact distances are irrelevant; relative distance is all it takes to make it work.
Is the ratio of visual-acuity-to-movement-speed among vampires higher or lower than humans? That is, assuming average vampires and average humans, is the time to cross the distance across which you can positively identify someone about the same? (To put it another way, when Bella identifies Jasper, does she have a better or worse chance to escape than if a human saw another human who they wish to run away from?)
The limiting factors in human chases (losing the person, getting tired, giving up) don’t apply here, so all that matters is that Jasper is faster than Bella.
Bella can see Jasper’s scars (and other identifying features) from quite a long way away. She can see his eye color from an even longer way away. Exact distances are irrelevant; relative distance is all it takes to make it work.
Is the ratio of visual-acuity-to-movement-speed among vampires higher or lower than humans? That is, assuming average vampires and average humans, is the time to cross the distance across which you can positively identify someone about the same? (To put it another way, when Bella identifies Jasper, does she have a better or worse chance to escape than if a human saw another human who they wish to run away from?)
The limiting factors in human chases (losing the person, getting tired, giving up) don’t apply here, so all that matters is that Jasper is faster than Bella.