I was on the outside of the place where u get the goron mAsk and I turned to normal link and tried to jump into the water I landed head first on the ice
Well, in real life if something like that happened, yes you should have died.
But since this is a video game, if you survived, then you shouldn't of died.
If you only had one heart left (of half if you have double defence) then yes, you should have died. N64 games, or any games, don't work the same way as real life.