The collision occurred around 17:30 on Friday 31 October 2025, involving what is believed to be an electric bike that failed to stop afterwards.
The two male riders, both wearing balaclavas, proceeded towards Levick Crescent.
Given the timing coincided with Halloween activities, when many people were outdoors, witnesses have encouraged to come forward.
Residents in the area are also asked to review any available CCTV, doorbell or dashcam recordings.
Information can be provided by calling 101 and quoting reference SE25209384.
Alternatively, those who wish to remain anonymous can do so by calling CrimeStoppers on 0800555111.
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