Trinculo, Stephano, and Caliban are together talking amongst each other. They don't notice that Ariel is spying on them.
We could overthrow Prospero. I want you and Trinculo steal his magic books and his daughter, Miranda.
And then kill him!
I can finally have his daughter and rule this island! HAHAHA!
Ariel creates confusion in the group by yelling out. Trinculo and Caliban start to argue with each other because when Ariel yells out, Caliban mistakes it for Trinculo yelling at him.
Oh My! I must tell Sir Prospero right away that they are plotting against him! I'll be off now!
Stephano steps in and tells Trinculo to stop bullying Caliban. Unfortunately, Ariel continues to call Caliban names and both, Caliban and Stephano, believe Trinculo isn't stopping, so Stephano beats Trinculo up.
When Trinculo is dealt with, Caliban proposes that together they all overthrow Prospero and kill him so that they may rule the island instead. Stephano agrees to Caliban's plan and so does Trinculo.
I agree to that plan!
Ariel overhears their plans and immediately decides to rush over to Prospero to tell Prospero the news.