Slap In The Face, First Form

Judging from the timing and conditions of the crime, only those who lived along this lane could have committed the crime within two minutes without leaving any trace.

Based on the statement given by the night watchman, he only heard a single cry for help. 

He thought he had heard wrongly since it happened in a flash. 

Yan Liu'er also mentioned today that she felt somebody was watching her when she came back.

Helian Wei Wei's first intuition told her that Yan Liu'er was not overthinking things. Sometimes, a human's sixth sense could detect danger way before the eyes could. 

Which meant that the danger from that time was hidden somewhere along this street.

If Helian Wei Wei's assumption was correct, the night watchman probably did not misheard anything. Rather, that person only managed to scream for help once. 

This was where the uncertainty arised.