A man from Oklahoma is accused of shooting the husband of a woman he is romantically involved with — later explaining to authorities that he resorted to using a gun during a confrontation in the parking lot last week because he couldn’t “outfight” the man, according to police reports.

“I couldn’t do anything unless I shot him,” Micah Hill, 21, allegedly confessed to investigators following the Tuesday shooting in Edmond, as noted in his probable cause affidavit, obtained by the local ABC affiliate KOCO.

Hill admitted to cops that he was at a local plasma donation center, Biomat USA Plasma Center, with his girlfriend when the husband confronted him in the parking lot while the woman was inside, per the affidavit. He claimed the husband had “previously spit in his face” and “threatened him,” according to cops, and that he was allegedly acting hostile toward Hill outside the plasma center.

Hill allegedly told police he “felt scared sitting inside the car” and decided to exit with a pistol. He admitted to shooting the victim twice and said the shots rang out after the husband began to “pretty much lunge” at him, KOCO reports.

A 911 caller from inside the plasma center described seeing Hill and what allegedly unfolded after the shooting, according to the affidavit.

“A gentleman walked in and was yelling ‘Help, help, I need help. He shot me. He shot me,'” the caller said.

Jacob McDonald, another patron, told the local NBC affiliate KFOR that the victim “collapsed and doubled over” after stumbling inside. “That’s when we saw he had a gunshot wound in his back,” McDonald recounted. “Then the shooter came after him and explained to us that this man had approached him.”

Hill has been charged with assault with a deadly weapon. He has allegedly claimed self-defense.