That is by design - the click is the failsafe mechanism locking the sear.
If he’s managing to pressure the main trigger blade without taking up the slack in the accutrigger blade, that honestly takes quite a bit of doing and indicates a very uneven trigger pull.
It’s built that way so you (or a twig, or your gear) can’t just bump the edge of the trigger blade to set it off, you need to take the pressure up square from the front, activating the accutrigger blade first. Basically a second safety.
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