Turbo / blowby. Quest

[phxeent]

Hi. Just wondering if someone could answer a Silly Question for me. Where the crankcase( Blowby ) vent hose goes back into turbo. When its disconnected ( @ idle ). How come there is a steady stream of air blowing outward?.. from turbo end When @ Revs its nominal suction?. Just thought there would be suction @ all times???

Thanks

Nathan
2013 D22