Wonderful Krishna
Krishna's friends know that Krishna is very special.
They have seen Him do miracles.
Have seen Him kill so many demons.
They have full faith in Him. 
and love to see Him kill demons.
For instance. Aghasura, one of the servants of Kamsa,
Was sent to Vrndavan to kill Krishna and his friends.
Demons have the ability to take any shape they want
and this demon took the form of a giant serpent
and lay down in the road with his mouth open to look like cave opening. Inviting the boys to come and have fun and go inside the cave.
The boys saw this. But they knew what it was.
A giant serpent lying down trying to look like a cave
wanting to swallow all of them.
They could even smell a nasty smell coming from his intestines.
They welcomed the challenge
and cheerfully entered the mouth of the demon
with full faith that Krishna would save them.
And He did. He also entered the mouth of Aghasura
and burst him from the inside.
Also in the Talavana forest there were delicious fruits
that no one could take because the demons were there.
Dhenukasura who had taken the form of an ass
along with many associates similarly in the form of asses..
Also sent by Kamsa.
The boys pleaded with Krishna
that they really wanted to taste the fruits in the beautiful forest.
To please kill the demons there.
They all entered the Talavana forest.
And sure enough as soon as they began to collect the fruits
Dhenukasura and his cohorts attacked.
Krishna and Balarama grabbed them by their hind legs
and swung them around with such force
they landed in the trees and lost their lives.
The wonderful thing about these demons
being killed by Krishna is
that they gain liberation from the material concept of life.
The sankirtana is like that.
The demons come out as soon as
there is the sound of the Holy Name...Krishna.
With full faith in Krishna... the glorification
of the of Absolute Truth is going on.
The asses the serpents are coming.
And Krishna is killing them and liberating them.
Wonderful Krishna.