Officers were scrambled to the scene at around 12.30pm and discovered the body of a man after being directed to a property by residents and business owners nearby.
During this time, a man was tasered and arrested close to the scene.
He was detained on suspicion of murder and remains in police custody for questioning
The injured woman is now being treated in Salford Royal Hospital and was said to be conscious and breathing when paramedics attended to her.
The identities and ages of those involved have not yet been released.
Ashley Jackson, who works at Higher Road Auto Services on nearby Higher Road, told the M.E.N. of the terrifying moment the woman, who was ‘covered in blood’, staggered into the garage followed by a man carrying two metal bars.
To protect the injured woman, five men at the garage put up a ‘human wall’ to block him getting in, and protected her until police arrived.
Mr Jackson said: “A woman came in, she was screaming and her head was pouring with blood from her cut. We brought her into the garage and tried to clean her up.
“Then a guy came over towards us with two metal bars and basically looked like he wanted to do some damage. We told him to leave and he did.
“We locked the woman in our office to protect her until the police got here. Then they went and searched the building where he lived.”
It is understood police then attended a nearby flat and discovered a man’s body. Officers then deployed a Taser on a man before arresting him.
As cordons were put up and roads closed around the scene, the open door to an Atkinson Road flat was guarded by officers.
A tent was put up nearby as forensics teams combed the road and several others nearby for evidence. They were also seen going into the flat.
Atkinson Road and Higher Road were closed as the probe continued into the evening.
A number of residents reported hearing screams from the injured woman before police rushed to the scene.
One, who asked not to be named, said: “This isn’t good on our patch. It’s scary. I can’t believe this has happened so close to home.”
Detective Inspector Carl Gilbert of GMP’s Trafford borough said: “We are in the very early stages of our enquiries but I would like to extend my sincere condolences to the family of this man. “Local residents may notice an increase in police presence as we conduct our enquiries and should they have any concerns about this incident then I would say feel free to approach these officers and raise them.”