On newer generation pressure cookers, if the steam vent gets blocked, a safety spring will eject excess pressure and if that fails, the gasket will expand and release excess pressure downwards between the lid and the pan.
2.
The Bauer utilized a different auto safety spring and the barrel was removed ( and the slide released from the receiver ) by twisting it clockwise 45 degrees from top dead center, rather than counterclockwise, as is the case with the Baby Browning pistol.