Jeval and Treads may not have done anything illegal. But that does not mean the law won't come after them anyway. Treads clearly understand this.
Ah, and Helen does as well. Now Jeval is getting a good look at how bigotry is not simply one person calling another a bad word. It is entrenched within systems of power designed to protect those in the in-group, and oppress those in the out-group.
I recall a neo-Nazi fight club - I think it was RAM - that regularly assaulted people in public, often while the police stood by and watched. They would even post videos of it online to brag. When people fought back, they were the ones who got arrested. Not the Nazis. Eventually the FBI got involved and finally arrested a handful of them after Heather Heyer was murdered, but that was only after years.
The guards are lazy. No kidding, Kevin is one of them!
So Jeval is going on the lam. Poor kid.

But speaking as a writer, I recognize an inciting event when I see one. This just might be the call to action that sends Jeval down his path as the protagonist in a high fantasy tale of adventure! Or not. We will see. Granted, from the sneak peek we have seen of Jeval's future as a member of the Underground Railroad, something like that obviously does happen.
Uh oh, the city is on lockdown, because of the Nerevarine? Oh boy, this throws a wrench in the works.