CLEVELAND -- There was key testimony Friday in the trial of Biswanath Halder, who is facing charges in connection with a seven-hour shooting rampage in which one person died and two others were injured, NewsChannel5 reported.

Halder faces the death penalty if he is convicted of aggravated murder.

Health care economics professor Avi Dor, who suffers from multiple sclerosis, testified Friday. He said he faked his own death to save his life when he realized a gunman was approaching him in a hallway at the business school of Case Western Reserve University.

Susan Helper, an economics professor, also testified that she initially thought the gunman was a bicycle messenger. She realized she was wrong and that the man wearing the Army helmet and flak jacket standing a few feet from her was "probably the scariest thing I've ever seen."

Helper was one of the two surviving victims shot on May 9, 2003, in which a third victim, student Norman Wallace, died.

"I saw him raising the gun to shoot me, I imagined, and I started to shut the door," Helper testified. About the same time, she heard and felt a blast -- the crack of a gun and a thump on her chest as she had been shot.

The other survivor, Argun Saatcioglu, then a doctoral candidate at the Weatherhead School of Management, testified that he first thought the man was a police officer responding to the chaos inside the Peter B. Lewis Building. He said the man slowly raised a gun and pointed it at him. Saatcioglu recalled shouting, "Whoa -- stop!" just before the gun fired. A bullet ripped into his right buttock. Saatcioglu, bleeding profusely, ran down a stairwell and outside.

Halder, 65, didn't look up as the two victims testified. Prosecutors said the man came to the school that day with more than 1,000 rounds of ammunition because he believed a school computer lab employee hacked into his Web site devoted to helping fellow India natives form businesses.

Saatcioglu and Helper squirmed as they told the court how they still battle the physical and psychological aftermath of the event. Helper gave an example of hearing fireworks at an Independence Day block party a year later.

"It was kind of like being back in that building," she recounted. "I kept looking at my hands, expecting to see blood."

WEWS reported Cleveland police Sgt. Ronald Dodus also took the stand and explained why it was tough to catch Halder inside the Peter B. Lewis Building.

"They've talked about the curved walls, but the problem is it’s an atrium-style building," said Dodus. "The suspect from the fifth floor to the basement could have an open shot at anyone at any point in that building."

Dodus also said when officers entered the building they found Wallace fatally wounded on the floor.