In Denver, after boarding the plane and backing away from the gate, a passenger was too ill to travel and we had to return to the gate to let the passenger off. They then had to find the persons bag. That took about an hour. And then a mechanical issue was found. We departed an hour late. Upon on arrival to Amsterdam we were unloaded on the runway on to a bus. We did finally find the rest of our group for the next leg of the journey.