drrich2
Contributor
Usually it's a bit more "Yeah... Bob... you can tag along with Joe and Mary or follow the DM if you like."
If something goes wrong, not hard to imagine that the DM thinks Bob is with Joe and Mary. Joe and Mary thinks Bob is with the DM.
It also seems to me that actual diver practice in aquarium-like excellent conditions (e.g.: great viz., minimal current) often doesn't entail the side-by-side, glance at each other every several seconds/closely monitor your buddy type of practice that is sometimes held up as more ideal.
Instead, both buddies may follow the group, fairly close to each other, and if you need me, swim over & nudge me. Occasionally look over to see your buddy's still fairly close. Which in some conditions may be adequate if the buddy gets low on air or has some gear malfunction.
Frequently looking over in case your buddy's having a heart attack, seizure, been grabbed by a big shark, etc..., no.
Other threads have made obvious that people vary widely in their perceptions of appropriate buddy expectations (and some may even think their view ought to obviously be right to others, who don't always see it that way).
Richard.