Well, it started out as a continuation of last season's episode with the hospital being evacuated because of the suspected small pox case. Abby, Carter, that one new guy, and Cheng Mei all had to remained quarantined in the basically empty hospital for 2 weeks. As you may have guessed, Abby and Carter "extended" their relationship. Elizabeth had moved back to London, and was shown at a hopital there. Anyway, during the evacuation, Susan, Luca, and Romano are moving 2 critical patients up to the roof for pickup by a helicopter. Well, there's 1 shopper and 2 patients. They are arguing over who gets to go first when the medical chart slips and falls off of the bed of Romano's pateint. He bends over to pick it up, and when he stands up, the rear blade of the chopper shears off his arm! It was intense! Very realistically portrayed. The arm was surgically reattached, but of course, we do not know if Romano will have full use of it.