The BAC 1-11 suffered an explosive decompression which almost removed the Captain from the aircraft, so which way was the air going?. The airflow over the open/missing windshield is more likely to remove air from the cabin than to force air into it. The Antonov freight door is not 'forward facing' , no freight door is, it is flush with the fuselage, and therefore, the airflow. There is insufficient ram-air effect to help keep a cabin pressurised at altitude. The differential pressure is over 8.5 psi and this will overcome any airflow effect. If there is a major hole in the airframe for whatever the reason, believe me, you will be too busy putting on your oxygen mask and getting down to low altitude to worry about how quickly the cabin is climbing.