The incident happened on Tuesday, September 29, at around 6pm in Hickman Street, Gainsborough.
The man is described as white, slim build, aged in his 30s.
He was wearing black clothing and a black face mask.
An area search was completed but the man was not found.
Anyone with information to assist the police with their investigation should call 101 with quoting incident number 352 of September 29.
Alternatively you can call Crimestoppers anonymously on 0800 555 111.
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