Jaya Guru Datta.
It is very interesting that we should never use the weapon unless we know how to recall it.
The young son of Sage, who cursed king Parikshit, also didn't have the knowledge to recall his curse. And his wise father was very disappointed.
We should never do, say or wish anything bad to people - since we have no idea how it will end and how it will come back to us.
Thank you for teaching this lesson.
Sri Guru Datta.