I don't think solo diving is an option when I can't find a proper buddy for a dive... so I wouldn't be in that situation
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simbrooks:I have been known to have a buddy turn away and swim off, as soon as i realised this i swam over to where he was to keep within a reasonable buddy distance. Turns out he saw something and didnt contact me about it. If it were to have happened again i would have had UW "words" with him or called the dive (at least my part of it). Just an example of listening to their bubbles, having an awareness of where they are and of course doing something about it before this kind of thing happens.
simbrooks:Good to have you back Mike, been away? There is a talk on IT's and ITC candidates you might want to look at
It wont get you very far due to its tiny size, do a search!m7scuba:Someone said not to buy spareair... why was that?
Quarrior:You can also take some of the expanding air out of your BC to breath from. You now have some extra air you didn't have before. .
simbrooks:If you have a persistent fear about your buddy, talk to them on the surface in the pre-dive brief about asking them to signal you if they are going off. Of course this assumes a nice buddy of convenience! Its a two way street though, and even if they decide to scoot, i would do my best to keep up with them (due to them being my redundant air), then do the above, discuss or end the dive. If they did a polaris to the surface i would follow up at a safe rate, probably go past the safety stop to check on them and take a longer stop on the second dive (assuming there was one).