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These were free divers, correct?
After several decades of experience with the main-stream "Ab diver" of Northern California, these incidents do not come as a surprise.
Their understanding of what they're doing (apnea diving) isn't much. They mostly dive horribly overweighted. A dive buddy is someone on the other side of the kelp bed, or, someone you drove to the coast with.
Any mid-level spearo or someone with real freediving experience can limit out with huge abalone; all you have to do is be able to get down deeper than 20', because the usual ab diver is lucky to get below 10'.
Time after time we get people that come into the shop looking for a "7 mil wetsuit and a 40 lb belt" because that's what their very experienced abalone diver friends told them to get.
...Sad.
All the best, James