When Joseph reached them they just went for him. It doesn't say so, but they must have beaten him severely and punched him, and then stripped his coat off him, and cast him into a pit.
Here is an example of how terrible is the way that sin reasons with itself. It sets its own boundaries and tries to convince itself that it is not as bad as it could be. We won’t kill our brother, but we will certainly sell him into slavery, without any prospect of him ever being freed again. We will be completely indifferent to his future happiness and his anxiety and his pleading with us, but at least we will not have taken his life. We could never do such a terrible thing as that! What hypocrisy! What specimens they are!
We see some more grounds for making Joseph a type of Christ: Joseph very a very godly young man; Christ was without sin; his brothers want to kill the one whom their future salvation depended on; Joseph is cast into a pit and Christ rejected; Joseph is handed over to outsiders and Christ is delivered over to the Romans.