You see a woman getting beat senseless how do you react?

You see a woman getting beat senseless how do you react?
You are driving near a very isolated alleyway where you catch a young woman being pinned to the ground, receiving punches over and over again by a man about the same size as you, probably older than you are. In reality what would you really do? Remember every second counts.
Physically help her
Call 911
Pretend I didn't see anything, it isn't my buisness
A mixture of two of the answers
Other (explain)
Select gender and age to cast your vote:
You see a woman getting beat senseless how do you react?
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