() It’s a concern every New Yorker has tucked away in the back of his or her mind: What would happen if I were to fall or get pushed on the subway tracks? On Monday, that nightmare became a reality for one NYC resident, and police are saying it happened at the hands of another “deranged” passenger. And now a picture shows the moments before the man’s death and authorities have released video showing what they believe is the argument that led up to the alleged murder.

The victim, 58-year-old Ki-Suck Han of Queens, was at the 49th street station near Times Square when he apparently confronted another passenger who was “acting crazy,” according to WPIX-TV (there is also a report that Han may have left his home earlier that day angry and intoxicated). That conversation went south in a hurry, and the man eventually threw Han onto the tracks as a train approached. Han frantically tried to climb back on the platform, but to no avail.

Freelance photographer R. Umar Abbasi ran toward Han and started firing his flash in order to get the train to stop.

“I just started running, running, hoping that the driver could see my flash,” Abbasi told the New York Post.

The train did slow down, but it could not stop in time. Abbasi said it eventually “crushed him like a rag doll.”

You can see the incredible, heartbreaking photos Abbasi captured moments before Han’s death in the video report below:

But that wasn’t the only image captured as the incident unfolded. One bystander captured the argument between Han and his attacker and turned it over to police, and authorities have now released it in hopes of identifying and capturing the man:

Read more: The Blaze