The comfort retailer cashier who bought cigarettes to George Floyd and was handed a counterfeit $20 invoice in return has taken the stand at former officer Derek Chauvin's homicide trial.Prosecutors have been on Wednesday (Thursday AEDT) laying out the sequence of occasions that led to Mr Floyd's ill-fated arrest outdoors the store.Christopher Martin, 19, stated as he stood on the curb a short while later, his fingers on his head as he watched Floyd's arrest, he felt "disbelief — and guilt."READ MORE: Teen who shot Floyd video says he was 'begging for his life'"If I’d've simply not tooken (sic) the invoice, this might've been prevented," Mr Martin testified, becoming a member of the burgeoning listing of onlookers who stated they felt a way of helplessness and lingering guilt over the Black man's loss of life final Could.Prosecutors performed retailer safety footage displaying Mr Floyd in Cup Meals for about 10 minutes, including to the mountain of video documenting what occurred.Mr Martin stated he instantly believed the $20 Mr Floyd gave him was pretend however accepted it regardless that retailer coverage was that the quantity can be taken out of his paycheck.The cashier stated he initially deliberate to simply put the invoice on his "tab" however then second-guessed himself and advised a supervisor, who despatched him outdoors to ask Mr Floyd to return to the shop.READ MORE: 'The very life was squeezed out of him': George Floyd trial beginsThe 46-year-old was later arrested outdoors, the place Mr Chauvin pinned his knee on his neck for what prosecutors stated was 9 minutes, 29 seconds, as a handcuffed Floyd lay face-down on the pavement. The Black man was later pronounced lifeless at a hospital.Mr Martin stated when he requested Mr Floyd if he performed baseball, the person replied that he performed soccer however it took a while to reply, so "it could seem that he was excessive."The defence has argued the now-fired white officer did what his coaching advised him to do.It was argued that Mr Floyd's loss of life was not attributable to Mr Chauvin's knee on his neck, as prosecutors contend, however by a mixture of unlawful drug use, coronary heart illness, hypertension and the adrenaline flowing by way of his physique.Mr Martin went outdoors as folks have been gathering on the curb and yelling at officers. He took out his cellphone and commenced recording however later deleted it explaining that the ambulance didn't take the quickest path to the hospital so he thought Floyd died."I simply didn't wish to have to indicate it (the video) to anybody," he stated.Genevieve Hansen, one in every of a number of bystanders seen and heard shouting on the officer as he pinned Mr Floyd down, wept on Tuesday (Wednesday AEDT) as she recalled being prevented from utilizing her EMT coaching to assist Mr Floyd. She described her desperation as she recounted how she was unable to come back to the person's support or inform police what to do, reminiscent of administering chest compressions."There was a person being killed," stated Ms Hansen, who testified in her costume uniform and detailed her emergency medical technician coaching. "I’d have been capable of present medical consideration to one of the best of my talents. And this human was denied that proper."Mr Chauvin, 45, is charged with homicide and manslaughter. Probably the most critical cost in opposition to him carries as much as 40 years in jail.Mr Floyd's loss of life, together with the harrowing bystander video of him pleading that he couldn't breathe as onlookers yelled at Mr Chauvin to get off, triggered sometimes-violent protests all over the world and a reckoning over racism and police brutality throughout the US.A number of onlookers testified on Tuesday (Wednesday AEDT) about their rising frustration, anger and despair as they begged Mr Chauvin to take his knee off Mr Floyd's neck. Witnesses and video depicted police maintaining again a few of these on the sidewalk who tried to intervene.Mr Chauvin appeared unmoved by their pleas, in keeping with the bystanders, together with {the teenager} who shot the video that set off nationwide protests. "He didn't care. It appeared as if he didn't care what we have been saying," stated 18-year-old Darnella Frazier, one in every of a number of witnesses who testified by way of tears. She stated he gave the bystanders a "chilly" and "heartless" look.Mr Chauvin continued to kneel on Floyd whereas fellow officer Tou Thao held again about 15 onlookers, even when Ms Hansen recognized herself as a firefighter and pleaded repeatedly to test Floyd's pulse, in keeping with witnesses and bystander video."They positively put their fingers on the Mace, and all of us pulled again," Ms Frazier advised the jury.The testimony from the prosecution witnesses was apparently aimed toward displaying Mr Chauvin had a number of alternatives to consider what he was doing and alter course.However defence legal professional Eric Nelson sought to convey proof onlookers have been agitated, in an obvious try to indicate that the police have been distracted by what they perceived as a rising and more and more hostile crowd.Witnesses testified that no bystanders interfered with police.