King Charles sparked fresh concerns for his health during his visit to Australia. RadarOnline.com can reveal the cancer-stricken monarch left a lunch held in his honor after just 10 minutes. Amid fears Charles’ cancer battle has impacted his ability to serve as king, indigenous Australian senator Lidia Thorpe shared a political cartoon depicting the monarch being beheaded after she heckled him following his address to parliament. The Australian tour marked the first time Charles traveled overseas since he announced his cancer diagnosis in February. After taking a rest day on Saturday, Charles …