Cynthia Milburn is chief executive officer of Epilepsy South Central Ontario, which provides education on seizures and advocates for people who experience them. Milburn said Canadian Tire, the paramedics and police should have handled the situation better and likely need more training.

"Upon arrival, officers were met with escalating behaviour that included physically assaulting two officers," Penman said in a written statement, adding Charles also assaulted a paramedic.

Chantelle Chevrier posted to social media about what she said occurred over the weekend, and confirmed to CBC Hamilton the posts were hers. She said she and her partner, Marcus Charles, won't speak out further until they get a lawyer.

"Medical distress should never be met with force and we condemn these blatant acts of violence against a member of our community who required urgent medical attention," the statement said.

"Dealing with a seizure of any type ... just walk around with them and talk to them. It's all going to be irrational behaviour ... but seizures end."

Hamilton police spokesperson Jackie Penman told CBC Hamilton that police received a call from paramedics because of a "combative patient."

Chevrier said Charles, who has epilepsy, had a seizure while working at Canadian Tire on Sunday afternoon. The type of seizure he had is unclear.

A person off camera, seemingly recording the video, says an officer used the Taser after Charles was standing and taking a breath instead of following officers' orders to sit down.

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Penman said police never pulled out their firearms, but did use a Taser "for the safety of the individual, officers and paramedics," and to get control of the situation. The entire interaction, she said, lasted nearly 48 minutes.

"Hamilton police have obtained video that shows the entire incident and the officers' actions were appropriate to the situation they faced," she wrote.

According to Penman, Charles assaulted a paramedic and two police officers, one of whom got a concussion. As a result, three assault charges have been laid against him, she said.

"Especially those who are in medical distress calling for help from the people who are supposed to help our community … instead they did more damage than the actual seizure," she wrote on the GoFundMe page.

"You have to talk very calmly to a person having a seizure — they need reassurance, they need to be calmed down. They don't need someone coming at them with weapons. It's just appalling."

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Bobby Hristova is a journalist with CBC Marketplace. He's passionate about investigative reporting and accountability journalism that drives change. He has worked with CBC Hamilton since 2019 and also worked with CBC Toronto's Enterprise Team. Before CBC, Bobby worked for National Post, CityNews and as a freelancer.

Chevrier wrote on Facebook that Charles didn't assault anyone and said what happened to him should "never happen to anyone."

A Hamilton woman says she's "disgusted" that Hamilton police officers used a Taser on her partner shortly after he suffered a seizure, and then charged him with three counts of assault, saying he concussed an officer during the incident.

"Moments after being Tased, multiple officers manhandle Marcus to the ground where they then sat on his chest and neck," she wrote.

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"We are appalled by the HPS and paramedics' response to the situation … We view this incident … with the knowledge that people who live with the intersections of Blackness and disability are twice as likely to experience police violence and be viewed as threatening when they are in need of support."

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A seven-second video appears to show Charles being shocked while lying on the ground. He appears to reach for an officer's leg before the officer grabs him.

It was co-signed by the Hamilton Centre for Civic Inclusion, the Hamilton Anti-Racism Resource Centre, the Hamilton Community Legal Clinic and the Disability Justice Network of Ontario.

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"Marcus was screaming in pain, the video will make goose bumps all over your body," she wrote on a GoFundMe page that says Charles "will need legal help."

Another video, which runs for almost 90 seconds, appears to show Charles on the ground screaming as officers and paramedics surround him.