A week ago, reserve defensive lineman BJ Thompson of the Kansas City Chiefs was living the high life as the Super Bowl champs visited the White House. On Thursday, he was fortunate to be alive. Thompson “had a seizure in a special teams meeting and went into cardiac arrest,” NFL Network’s Tom Pelissero posted on social media platform X. “The #Chiefs canceled all team activities today after a backup defensive lineman had a seizure in a special teams meeting and went into cardiac arrest, per sources,” he posted. “The team’s medical staff worked quickly, an ambulance was called and the player is …