in the footbridge problem, the agent is standing on a small bridge over a trolley track. again, there is a trolley with no brakes moving very fast to five people. it will hit and kill the people if nothing stops it. they cannot move out of the way. there is also a second person on the footbridge. if the agent pushes this one person off the footbridge, then their body will stop the trolley, saving the five other people. but the one person whom the agent has pushed will die. in this problem, the person the agent would push is big and fat enough to stop the trolley, but the agent is not.