[Lisa Fishman]

The doctors were evacuating the hospital and taking patients to the roof so they could leave by helicoptor. Ramano was loading a patient into the helicopter and accidently got caught in the rotating blades. Arm goes flying off.
I would not be surprised if this was ER's last season. It really has "jumped the shark". In other words, the producers wanted to get the audiences' attention by pulling something like this. Now the show will never be the same and ratings will drop. This will cause the show to cancel. This seems to happen to shows that have been around for 8-9 years. That's my prediction.... we will see what comes of it in the next couple of months.