Like those toddlers who get stuck in a fence or alikes. How can they put their head in but once it’s past it’s impossible to get it out again. Or even a ring, a couple of minutes after putting it in it’s harder to get it out
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With a head getting stuck in a fence it’s more about a specific head position being achieved that allowed passage in but once that’s done their head position changes and it’s more difficult to get out. They must achieve the same head position to achieve freedom.
As for rings I’m less certain. Perhaps it’s because of the shapes of the fingerbones? They allow easier sliding off than on.
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