ORLANDO — Just when you thought any worse wasn’t possible after blowing an eight-point overtime lead in Detroit at the start of the week, it got worse for the Miami Heat at the end of the week. Against a severely depleted Orlando Magic roster, the absence of Jimmy Butler hardly appeared to register through the first three quarters for Erik Spoelstra’s team, with the Heat racing to a 25-point lead. And then, a collapse of epic proportions, and now, a three-game losing streak following Saturday night’s 121-114 loss at Kia Center. “These are tough lessons that we all have to learn,” Spoelstra said.