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The only times I have seen Dive Masters do this is when they are pointing something out to someone on the bottom. If they are "crashing into the bottom" they must have very strong fingers.
Relax and have fun.
Just a thought, having been a guide and DM, you often carry extra blocks of lead to pass up to the so called 'trained' divers who don't have a clue what weight they need , and any form of trim is a mystery to them as well.
Try it with 6-to -9lb of extra lead in pockets.
True, Most guides do just that, there is a qualifier, I did say most.
Have you been a pro guide, worked at a resort, etc ? Do it enough you don't even think about it [ lugging extra blocks of lead ], stay off the bottom, reef , sand or whatever, never finger walking , what a funny term .
We have all seen [if you dive enough in some parts of the world] the quality of some guides, some fantastic, others, not so.
I have gone too far off topic.
Edit: Deleted some examples of how some guides could be better , and the lack of training, that horse has been flogged to death.