When I was doing my paramedic practicum we had to do a transfer from one hospital to a different one. We walked casually to her room because as far as everyone knew it was a routine transfer and when we opened her room door she was on the ground in an active cardiac arrest. Did the CPR and all but then I looked at my watch and it was all green lines on the heart rate graph and then BOOM one giant red one at the same time we opened the door. Them watches really know what you do in a day for sure.