Help me i cant complete The pumpkin boss event

Hello. I'm a Japanese who recently started this game.

Please tell me about the event of beating the current Pumpkin Boss.

After putting "bait trap", huge pumpkin comes out so I am in trouble because I cant understand the subsequent strategy of attack, so my English skill like a zombies....

What shuld i do next after bait trap??

please tell me brother and im waiting for your answer.