I think Bubbletrubble's post (as usual) is absolutely beautiful.
The primary problem here, as I see it, is acquiring a buddy at depth and having it be someone about whom you know nothing. So all the many things you can and should do to ensure that a dive goes smoothly (including setting a hard deck and comparing signals) never took place. So you had a setup for things going crosswise.
Given that you got INTO that bad situation, is there anything you could have done to make it better? Well, wetnotes might have helped here. Having a spool you could tie off on the wreck to search for your buddy might have helped, although I'm definitely of two minds about the utility of line in the hands of people with no training and little experience handling it -- it can be a VERY evil two-edged sword. I can empathize with the inability to read someone's gauge, even when you've got it in your hands. One of the reasons I use the gauges I do is because they are easy to read -- for me, and for my teammates. A quick glance at an analog SPG gives you "full, halfway, or near-empty", and that's generally what you're interested in. Digital readouts are often in very small numbers, and can be difficult to light so that you can see them well in low light/low viz.
I think what you got was a lesson in divemastering . . . You can't count on someone having the bandwidth to communicate effectively, or manage their gas well, or understand your signals (something I had HORRIBLE problems with as a new diver, and even today if someone starts trying to communicate something complicated in rapid signs). It was a divemastering job you didn't sign up for, and that's the biggest lesson. If you don't want to end up trying to take care of somebody in trouble, don't allow circumstances to hand you unknown dive buddies underwater.
The primary problem here, as I see it, is acquiring a buddy at depth and having it be someone about whom you know nothing. So all the many things you can and should do to ensure that a dive goes smoothly (including setting a hard deck and comparing signals) never took place. So you had a setup for things going crosswise.
Given that you got INTO that bad situation, is there anything you could have done to make it better? Well, wetnotes might have helped here. Having a spool you could tie off on the wreck to search for your buddy might have helped, although I'm definitely of two minds about the utility of line in the hands of people with no training and little experience handling it -- it can be a VERY evil two-edged sword. I can empathize with the inability to read someone's gauge, even when you've got it in your hands. One of the reasons I use the gauges I do is because they are easy to read -- for me, and for my teammates. A quick glance at an analog SPG gives you "full, halfway, or near-empty", and that's generally what you're interested in. Digital readouts are often in very small numbers, and can be difficult to light so that you can see them well in low light/low viz.
I think what you got was a lesson in divemastering . . . You can't count on someone having the bandwidth to communicate effectively, or manage their gas well, or understand your signals (something I had HORRIBLE problems with as a new diver, and even today if someone starts trying to communicate something complicated in rapid signs). It was a divemastering job you didn't sign up for, and that's the biggest lesson. If you don't want to end up trying to take care of somebody in trouble, don't allow circumstances to hand you unknown dive buddies underwater.