KHALID ABDELAZIZ and NAFISA ELTAHIR RESIDENTS in an affluent district of Khartoum feared there would be trouble when they found their new neighbour was a commander from a paramilitary force that protesters blamed for cracking down on them in the past. Those concerns proved well-founded this week when people were forced to hunker down in their homes as gunfire, shelling and airstrikes raged across the city in a fierce fight for power between the army and paramilitary Rapid Support Forces (RSF). "We knew a day like this would come," said Motasim, who lives a few buildings from Abdelrahim Dagalo, deputy leader of the RSF, the…