Crystal, second draft

Today is Children's Day.  There is a sale of living creatures everywhere. This mollusk can morph into any animal shapes.
Mom bought a puppy shape for my little brother. The puppy could jump and bark and obediently follow us go home.
When he turned into a bird to fly away, I was too reluctant to let him go so that I accidentally tore him. He was torn, then changed into a soft shape and was dying quickly.
I tried to beat his heart, but it was useless. He died, or should not be called "dead or death" :the moment when the creature loses its vital state. For humans, it is very simple and easy to throw them away and buy another new one.
My Mom said, "I could buy another one don't be worry". My little brother had the same attitude.
I was the only one who cannot stop crying.