You should try to read the book I am not trying to be mean but it is an amazing book that you should take time to study.
Once he cut it off, he could use it as a weapon because it's powers still worked, so if someone attacked him he could just whip it out and use it as a weapon to turn his enemies to stone, which he does on few occasions and wins the fights that would either be impossible or much harder for him.
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The Cornell method has been proven to be very useful & is used throughout high school/college education. color coding notes & making them aesthetically pleasing can impact your focus on the info. flash cards or repetition is helpful in the memory process
Neither. Resistant is hesitant on going on with and yielding is stopping.