A 54-year-old man with severe ARDS is ventilated with VCV, TV 6 mL/kg IBW, PEEP 14 cmH2O, FiO2 0.8, RR 26/min. Plateau pressure is 30 cmH2O. The team initiates a recruitment manoeuvre using sustained inflation (40 cmH2O for 40 seconds). During the manoeuvre, the patient's blood pressure drops from 85/55 to 55/30 mmHg. What is the mechanism of the hypotension?