Geinosky and another Good Samaritan chased the man down near North Halsted and West Armitage in the heart of the Lincoln Park neighborhood.
In an apartment on Halsted, the woman discovered an intruder inside her home. She was shaken up, but physically, she's fine and very grateful to her building manager.
The suspect stabbed Geinosky in the arm and slashed the knife across his chest. But he became more determined to catch him.
"I felt the blood coming down and my adrenaline kicked in, and I said, 'There's no way he's going to get away with this,'" Geinosky siad.
He and his assistant manager were in Café Ba-Ba-Reeba, when a tenant came running in saying she had escaped from her apartment and a burglar. The men ran outside and saw the man leaving.
"The guy came at me with a knife and tried to stab me. I backed out of the way, the first thing I seen was a broom. So I hit him a couple of times with the broom," said Good Samaritan Mike Williams.
"The fact that he terrorized my tenant wasn't enough. But then to go ahead and elevate it, really just, I don't know, I just reacted," said Geinosky.
The men chased him down the block to a hair salon. Then when he ran out the back door, they chased him into a garage. He stayed there until police arrived and arrested him.
The neighbors called the men heroes.
"It is an awful thing, but I don't think I would have done anything anybody else would not have done," Geinosky said.
Geinosky is staying in the hospital overnight for observation. The alleged burglar is in custody. Police are reportedly looking into the possibility he's responsible for other burglaries in the neighborhood.