Would a rottweiler protect me if i was a stranger or just stand there and watch?

If a very well trained male rottweiler was waiting for his owner outside the shop untied and all of a sudden a women floored me and pulled out my testicles and crushed them slow till 1 ruptured and burst out causing very loud screams and cries of agony non stop, would the rottweiler help me or just stand there?
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