Sybil didn't try to help because she didn't Interpret the event as an emergency.
Sybil must be staying in a society wherein the population of teens is high and in late night because of parties and fun these people are horsing around and shouting in fun, joking laughing and pushing each other. they must be behaving in a silly and a noisy way.
So, sybil did not go and investigate more or any further on this as she didnt feel the event occuring could be an emergency to investigate upon.
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