Allowing one buddy to return to the boat / entry point while one or more buddies continues on - is OK - as long as the continuation doesn't occur until the continuing buddy/s is/are 100% certain the aborting buddy has safely made it back to the boat / entry point. Continuing on without this confirmation is unacceptable. No man/woman should be left to fend for him/herself in the open ocean when they entered with others. While I don't depend on my buddies for anything, I also don't expect them to ditch me until they have assured I'm safely back onboard.
I have often had to double back to check on someone - only to find they aborted or were in the process of aborting the dive. I hung out unde rthe boat until I saw the second fin disappear onto the swim platform. I know of enough occurrences where this did not occur... and it cost someone their life.
Strong currents certainly present challenges for ensuring aborted divers return safely... but while it is challenging - it is not impossible - especially if the boat is properly set up for diving in strong currents.
I have often had to double back to check on someone - only to find they aborted or were in the process of aborting the dive. I hung out unde rthe boat until I saw the second fin disappear onto the swim platform. I know of enough occurrences where this did not occur... and it cost someone their life.
Strong currents certainly present challenges for ensuring aborted divers return safely... but while it is challenging - it is not impossible - especially if the boat is properly set up for diving in strong currents.