The jump-straight-to-suing approach is to be honest a bit specific to the US. In the UK (like here) it’s more usual to deal with these sorts of things with a kind word, combined with hints of potential problems later.
They were champs! We even connected on LinkedIn with Colin afterwards and he actually offered us summer work but that fell through unfortunately.
He didn't pay you for the consulting time you have him?
Money is vain. They got much more out of it and the post very clearly states that.