A 17-year-old teenager remains in critical condition at Royal Hobart Hospital after being shot in the back during an altercation in South Hobart around 1am. A 25-year-old man has been arrested and charged with grievous bodily harm, aggravated assault and firearm offences. Police allege five people attended the South Hobart address with intent to cause an unlawful act, and investigators believe this was a targeted attack between people known to each other.