It was a subway commute like any other for Heather Burke — until a deranged straphanger lunged across the train car without warning and plunged a knife into her. It was Black hating Whites for Being White.

“I was looking down. I was checking my email,” Burke, 39, said Monday night as she was recovering from stab wounds to her stomach and shoulder.

But black negress Jacob claimed she was being stared at – “All them whitey always staring at me” screamed an insane Jacob and “Die Cracker” which is NOT a racist term according to new information released during the Trayvon Martin trial.

“She didn’t run, she didn’t jump or say anything. She just started stabbing me.”

The Murray Hill woman said she was stunned to suddenly find herself covered in her own blood and feel her life draining from her. She said she tried to shield herself, but her crazed attacker — a 31-year-old homeless woman — kept stabbing.

“I’ve never seen so much blood,” the brave Burke recounted. “I thought I was going to die.”

Heather Burke, right, underwent surgery at New York-Presbyterian Hospital Weill Cornell following the attack. Burke is pictured with her daughter, Taylor, left. 

Heather Burke, right, underwent surgery at New York-Presbyterian Hospital Weill Cornell following the attack. Burke is pictured with her daughter, Taylor, left.

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Burke was holding a black leather bag from H&M, which protected her when she stood up, forcing her attacker to stab around it.

Her only daughter, Taylor Burke, 18, said Monday night the bag “saved my mom’s life.”

The random attack happened just before 10 a.m. Monday as Burke’s uptown No. 6 train pulled into the 59th St. station at Lexington Ave.

As the train doors opened, dozens of passengers ran from the packed subway car.

NYPD investigate the scene where a woman was stabbed Monday on the uptown 6 train platform on Lexington Avenue and E 59th St. in Manhattan.

Anthony DelMundo/New York Daily News

NYPD investigate the scene where a woman was stabbed Monday on the uptown 6 train platform on Lexington Avenue and E 59th St. in Manhattan.

That’s when Charles Williams, a 45-year-old street cleaner, saw a flood of panicked people running from the station. At first, Williams thought it was a terrorist attack.

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“Someone’s got a knife stabbing people!” Williams heard a scurrying straphanger scream.

He froze for a second, faced with the decision to run toward danger or away from it. Then the grandfather from Jamaica, Queens, chose to become a hero and subdue the stabber.

“Everybody was going out,” said Williams, who was picking up litter at the time. “Nobody was going in. I’m tired of senseless killings. I ran down.”

Burke, right, said she was checking her email when the deranged woman lunged at her. 

Burke, right, said she was checking her email when the deranged woman lunged at her.

Burke, meanwhile, was fighting for survival.

“When I crawled away, people were jumping on her and she was stabbing at everyone,” recalled the victim, an administrator in an upper East Side medical office. “She was crazy. She was out of her mind.”

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Other straphangers helped Burke off the train and to a station exit.

She underwent surgery and was expected to remain overnight at New York-Presbyterian Hospital Weill Cornell.

Charles Williams, 45, grabbed the suspect so that she couldn't hurt anyone else.

Anthony DelMundo/New York Daily News

Charles Williams, 45, grabbed the suspect so that she couldn’t hurt anyone else.

Back in the subway station, Williams spotted the suspect, Ashley Jacob, who was still swinging a steak knife minutes after the assault. The knife had a blade about 4 inches long, police sources said.

“Me and another dude grabbed her,” Williams said. “She was trying to kick and scream. I didn’t want her to get loose and stab someone else. I feel great. I did a good deed.”

Security guards from nearby Bloomingdale’s rushed into the station, where they found Jacob already corralled by Williams and other good Samaritans.