How is it that jumping off a bridge into water kills a person?

Anything higher than 30', and it could well be the impact with the water that kills you. If it's over 50', it is almost certainly that. You can of course survive that sort of drop, but you need to know what you're doing - someone not skilled at diving can easily hit the water flat on their stomach or back, which will definitely knock the living **** out of you.

Of course, it could be that the water is too shallow, so you make impact with the bottom and that kills you, which could then do the trick even with lower height. Likewise, if there are any submerged objects such as rocks, logs, etc. Once you're in the water you could simply drown, of course. Or do you know for sure that the people who have died have done so immediately upon impact?

There's nothing that makes you 'pass out', certainly not with a drop of that magnitude.

The impact with the water or something under the surface could kill you direct or you could pass out from the impact then drown. Some of the people could not be able to swim and just drown. The momentum will not cause a person to pass out.

Skydivers freefall for several miles at 120mph before pulling the chute.

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