You were watching Katniss and Gale to make sure they wouldn’t get hurt as they made their way towards Snow’s Mansion. All the kids were gathered at the gate and Katniss saw her sister Prim tending to wounds. Katniss called Prim over but then Prim looked at Katniss and looked panicked. A bomb then went off blowing up all the children including Prim. You recognize the bomb as one of Gale’s bombs.