The scenario you describe is not new! Unfortunately, M/S nurses spend a lot of time completing tasks, infusions, admissions, etc from the ED. I know in my institution, the ED nurses cringe when I take report from them because I expect true SBAR HOC and question open orders, transfusions, etc. thanks to the EMR. They don't always take heed and complete the necessary open items when giving report from my staff, but when they give to me things are different. I consistently ask their manager, why that is the case and get a variety of responses. Many times, report comes from another M/S float nurse who is totally overwhelmed.
With take being said, I empower my nurses to take HOC the same way I do and ask the questions because once they assume responsibility for that patient (s) every outstanding issue is now theirs. Again, thanks to the EMR, we can support our questions and see exactly how busy the ER is, things are changing but slowly.
ER nurses are good in emergencies, but I challenge them to take the patient assignment a M/S nurse manages and see how an transfer from the ER with open orders, transfusions, medications can totally jam up the floor nurse.