MaxTorque
Contributor
In case of runaway inflator, first use the inflator's dump button, then disconnect the inflator hose. If the inflator hose is stuck, the dump button should release enough that you can do a controlled ascent.
this ^^
If you hold the inflator hose slightly above the bcd top level, as you would do when using the hose dump, then pretty much any air that rushes into the hose from a stuck inflator button / valve will want to then rush upwards and out, rather than against water pressure and travel down into the buoyancy bladder itself.
if you do this quickly, you can pretty much stop any significant change in your buoyancy, which means you have a bit more time to sort the actually problem, (by disconnecting the inflator pressure hose) rather than having to deal with the side effects ( an uncontrolled rush to the surface)