"You are so ugly, go away," the woman cried.
The victim sustained scalp injuries, a skull fracture, cuts on his left hand, and a fracture to his left tibia.
Unattended cooking was the likely cause of the fire, SCDF said.
The last time this happened was on 9 May.
The enforcement operations were conducted on 28 Sept and 13 Oct.
A 30-year-old male cyclist is assisting with investigations, the police said.
He struck her on the left cheek after being confronted.
He was promised returns of between 5% and 12% on his investment.
He was released 14 hours after the ransom was paid.
The pigeons tried escaping from the net, but to no avail.