A 26-year-old male is brought to the emergency department by ambulance after being stabbed in the chest during an altercation. The wound is located in the left 5th intercostal space, just medial to the midclavicular line. On arrival, he is conscious but visibly distressed. Vital signs: HR: 128 bpm, BP: 88/60 mmHg, RR: 28, SpO₂: 96% on 15L oxygen, Temp: 36.8°C The emergency physician is worried about this patient developing cardiac tamponade: