If your dumps are working properly, they should all be able to dump air faster than the inflator puts it in. They are designed that way for that purpose.
If you are like most people and have a pull dump on your inflator hose, you can pull the inflator hose hard with your left hand to vent the air that is coming in. If you do that with your elbow pointed down, you should be able to disconnect the hose with your right hand. This procedure is part of OW pool instruction, so you should have been taught to do it.
If you cannot disconnect the hose while it is under pressure, then the problem is that the connection needs a good cleaning. It should disconnect easily.
If you do not have a pull dump on your inflator hose (I don't), turn head down and fin while you pull on the rear dump. Again, you should be able to disconnect with the right hand.
If you are like most people and have a pull dump on your inflator hose, you can pull the inflator hose hard with your left hand to vent the air that is coming in. If you do that with your elbow pointed down, you should be able to disconnect the hose with your right hand. This procedure is part of OW pool instruction, so you should have been taught to do it.
If you cannot disconnect the hose while it is under pressure, then the problem is that the connection needs a good cleaning. It should disconnect easily.
If you do not have a pull dump on your inflator hose (I don't), turn head down and fin while you pull on the rear dump. Again, you should be able to disconnect with the right hand.