There are at least two mechanisms for creating havoc by quickly opening a gas valve that adds a high-pressure gas to a LOW-pressure oxygen environment.
Particle acceleration:
(self-explanatory)
Dieseling:
When breathing compressed gas (open circuit) you may notice that the gas is cold. The compressed gas in the cylinder starts out at dive temperature. When you expand a bit of that gas to a far greater volume (so that you can breathe it), the heat energy that it contains is "diluted" across the new volume. It is COLD. (Apologies to my old Thermo prof.)
All the same rules apply, now let's run it in reverse. Assume that there is 100% LOW-pressure O2 in the hose. It is at dive (or room) temperature. Now we jam all that energy down into a tiny space and INCREASE the temperature:
adiabatic compression - Gas compression engineering - Eng-Tips
The solution to either of the above problems, as supported by my O2 cleaning course, is simple. Open any enriched O2 gas valve ever so gently...