He came swimming along after us (the first time, since we ditched him, I guess, and caught up with us).
Jim's tank strap was undone totally, and I can't imagine how else it could have happened, but Fred played hero, and we figured "whatever". So far, nothing particularly weird except that...
Since we were MAJOR noobs, we were burning air like crazy, thus at the time he caught up with us, it was time to go back. Fred grabbed my hand, despite it being good viz, no surge, and kept insistantly tugging me off to someplace about a 45 degree angle from the wall, and Jim followed. I still figured this was a "diver thing", holding hands and going to some dive site, but the fact remained that we were low on air. I pulled my hand back, but he was very persistant. Still not realizing this was weird or out of the ordinary (noob noob noob), since Jim was up with us, I pointed at his gauge and showed him "Hey, low on air", and after one more effort to persuade me to go with him despite seeing the 550 psi, he let go and swam off.
Hardly a traumatic experience or anything, but quite weird. He grabbed my hand, but didn't grope me or anything (Jim would have drowned him). And after reading about Monterey Fred, I'm inclined to think that strap did not come undone by itself. When Fred pointed it out, the tank was quite literally floating free, and like I said, the strap was flipped, it wasn't just that it wasn't tight enough. So unless we're getting some particularly nimble sea lions...