A Malaysian court saw CCTV footage on Wednesday showing the Vietnamese suspect in the February murder of Kim Jong Nam smearing a substance on a person's face two days before the killing in an apparent practice session.
The footage showed Doan Thi Huong, 29, approaching a man quickly and swabbing both hands on his face in a "peek-a-boo" gesture before pulling them back and running away.
Doan and 25-year-old Siti Aishah of Indonesia have been charged with murder for the February 13 killing of Kim, the estranged half-brother of North Korean leader Kim Jong Un.
They are accused of wiping a highly toxic chemical nerve agent on Kim's face at Kuala Lumpur's international airport. 
The two have reportedly said they were tricked into carrying out the attack, which they thought was a television prank.
After the attack on Kim on February 13, Doan "was in a haste to leave the area, and the movement of her hands showed she was uncomfortable," police officer Nazrul Izham testified in court on Wednesday.
"She had her hands out [and] seemed as if she wanted to avoid touching her body or clothes," Izham added.
"I saw her face was nervous and she seemed like she wanted to get out of there ASAP," he said.
Doan headed straight to a washroom on another floor. She spent slightly more than a minute inside the washroom and when she emerged she seemed more relaxed, Izham said.
She could be seen using her mobile phone. She walked to the airport's taxi area, and Aisyah arrived shortly afterward, Izham said.
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