Even as he plunged his Rambo knife into the shop assistant's abdomen, he told her: "I am only performing my duty."
Before the assistant, Ms Sulianti Johari, 31, could react, the cigarette delivery man calmly walked to his van, smiling and waving, then drove off from the kiosk at an LRT station in Kuala Lumpur.
The morning peace in Taman Melati, a suburb in Kuala Lumpur, was shattered on Thursday when the man, 26, went on a stabbing spree, killing two people and injuring two others.
His 40 minutes of terror began at about 11.20am, The Star reported.
Ms Sulianti, who underwent surgery for her stab wound on Thursday, said she knew the man well.
"He was usually friendly with me. I thought of him as a younger brother," The Star quoted her as saying.
Sundry shop owner Lau Siew Ling, 49, was stabbed first.
She said she knew the suspect as he delivered cigarettes to her shop often. But this time he was looking like a man possessed.
"He looked different. After he stopped his car in front of my shop, he got out holding a knife. He did not say anything to me. He just walked towards me and stabbed me," she said.
Her husband accompanied her while she waited to undergo surgery.