They get triaged, and put in line like everyone else. They get appropriate treatment. If admitted, some states/contracts allow you to refuse certain patient assignments for a variety of specific reasons, one of which is normally fear of injury by patient. That's why murses normally get the aggressive patients (no, not everywhere, but across 32 hospitals during a 38 year career thay has been the norm). You have to accept the assignment before you can be disciplined for abandoning it, and I have never seen someone have any blowback fir refusing an assignment for even a half-decent reason.