The woman ran off with the male attacker
A man was attacked and robbed after he jumped into a lake believing a boy was drowning, only to find it was a dummy.
The dog walker was approached by a "distressed" couple in Foxes Forest, Portsmouth, who said their son had been attacked by a swan in nearby water.
When the 48-year-old jumped into the lake and discovered the dummy he saw the man going through his coat pockets.
He swam back to confront the thief but was sprayed in the face with an unknown liquid. The couple ran off with £100.
The theft happened at about 1045 GMT on 28 October in Foxes Forest recreational area in Peronne Road, Portsmouth.
An e-fit image of the woman has been released by Hampshire Constabulary in a bid to get witnesses to come forward.