Personally given that YOU were there and able to offer assistance I reckon you would have been better to "encourage" an octi or two to hook up in a comparitively safe place and where discretely possible a bit of silting up.
You know, that thought did briefly cross my mind. I also thought about just following for a bit without my light on and seeing how far they'd go before they turned the dive. Several things stopped me from going that route.
First and foremost, it would have put me in a liability situation if my attempt to "scare" them caused one to panic and bolt and subsequently got hurt or killed.
Secondly, while I had close to 175 cft of gas left, I wasn't in a position to share air with two divers at once if they ran out. Especially inexperienced divers that might be panicky if they ran out of gas in an overhead environment or with no concept of buddy breathing with 3 divers on 2 regs. I did have a buddy bottle with me that weekend, but had elected not to use it, so I wasn't carrying it at the time this happened.
Third, with two divers in there and me alone, I wasn't in a position to help both of them if they got separated.
Fourth, I was in a rental drysuit because I ripped a seal on mine. It had molded boots two sizes larger than I normally wear. I was diving the suit with unusually high amounts of squeeze because air getting in the boots made my fins very ineffective. While I was able to dive the suit, it was by no means optimal for mobility if I had to effect a rescue.
While I'm certain that an "experience" might have taught a valuable lesson I don't feel that it would have been the right approach for me to facilitate it.
Not to mention, Donna and Sam would never live it down if they let their SB dive buddy go into a cave alone after a couple of OW divers and I didn't make it back out.
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