Diver0001 once bubbled...
And don't forget at 35 metres you have a bit of air in your BCD that you could (given the parameters of the scenario) inhale and then exhale back into the bladder. I've heard it's bad for your health but it's probably not as bad as drowning..... I tried this once for the experiment and was still breathing after almost 5 minutes. That's enough to go to the surface or catch up with your buddy.
Cheers,
R..
When you studied scuba you studied dead air spaces, your exhaled air contains elevated levels of carbon dioxide and less oxygen. You don't have a scrubber in your BC, so don't dare attempt to "rebreath" your air from a closed space - you said you did this for 5 minutes (was it at depth?) you could have passed out!
Now I could see taking one maybe two good breaths off the jacket as you're coming up - but even this would be very risky because you're ascending the whole time. Also during the exchange from your regulator to the LPI - while trying to manage it and purge access water from the oral inflator aspirate on water.
Just be really careful trying to invent new techniques like this and please don't rebreath unscrubbed air. It would be like tying a plastic bag over your head and breathing till you passed out.