He's not hurting anything, but he's not getting a good 'feel' of the trigger either. Putting a finger, while trying the SA, under the hammer gives a better 'feel'. There's no good way for the DA, other than just pulling. It won't hurt a centre fire.
Some shops will have a hissy fit if you dry fire anything. Moreso with a BNIB handgun. A ballistic hissy fit if you dry fire a .22. Dry firing can damage a .22 though.
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