A 32-year-old man is brought to the emergency department following a motor vehicle collision. He was the unrestrained driver. On arrival, his blood pressure is 88/56 mmHg, heart rate 128/min, respiratory rate 24/min, and he is alert but anxious. His abdomen is distended with bruising over the left flank. Focused assessment with sonography for trauma (FAST) shows free fluid in the pelvis. After two large-bore IV lines are established and 2 L of crystalloid infused over 15 minutes, his blood pressure remains 92/58 mmHg and heart rate is still 120/min. What is the most appropriate next step in management?