Snails coming out of their shells and still living.

Okay guys I tried the ice filmed water trick to off the snail I actualy made my partner do it because I'm am a sissy when it comes to these things. I checked for heart beat moments after being sumerged in the water. I left it on a paper towel to make sure there were no movement and I am able to see its heart clearly. Seems that after the snail regains its temperature it's heart starts beating again. So again I put it back into the water for 5 more minutes. This snail will NOT die I dont want to keep torturing it with icy water so I put it into my breeder net and it's crawling around. This one is going to be up to nature. If anyone else has a painless idea of killing this snail please share. So far only 3 snails have done this and no sign of others trying to do the same.
 
Awwwwww....poor things! Never seen nor heard of this before. Wonder what caused it. Terribly sorry to hear about it.
 
all the snails that have come out of their shells are related? if so, then yes, it could be a genetic defect.
 
please post all of the water parameters,.. tested by liquid test kits,..
there must be something wrong for them all to get out of water just to hang
 
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