What Should I have done?

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That explains why I was confused when an instructor told me the dive computer needs to be on the right arm while the diver controls their BCD while ascending.
Not exactly. Even though you shouldn't have to ADD air to your BC when ascending, you still need to use the left hand for dumping gas from your BC as it expands, either from the corrugated hose/inflator, or from the dump valve, so it is absolutely recommended to have the computer on your right arm. Also, in case you dump too much while ascending, you might need to add a little bit back to remain neutral, especially to level out on your safety stop.
 
That explains why I was confused when an instructor told me the dive computer needs to be on the right arm while the diver controls their BCD while ascending.

So anyone who is overdriving their inflator button is a rank novice.

Or has been doing it that way for years.
 
What happens if I'm right handed? Can I dump air using the right hand?
It's not related to hand dominance. Inflator and dump valve is normally on the left side of the BC. Crossing the hand over is possible, but not comfortable.
 

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