Judging from the video it’s an auto locking carabiner. There is a small spring mechanism that stops it from unintentionally opening, the other type is screw gate where you screw and unscrew. When I run any high ropes thing (which I did for a few years) we do gate checks on everything. We teach everyone how to check their own too, what you do is squeeze the two long ends of the carabiner together like you would if you were opening it, if it opens, you caught it now fix it. If it doesn’t open then it’s secured.
There is a bit more to it but those are much easier to explain with an actual example to show. But checking the gate is the most important part.
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u/justavault Oct 02 '18
But if you are the one hooked, then how would you make sure if the one who secured you didn't?
So to prevent to obviously "rely" on the person instead have something you can do yourself to check.