In my house, cut feet get cleaned in the house with soap and water, especially if it is a puncture wound. Puncture wounds bleed for a long period of time---needs elevation and ice to stop the bleeding. (Also, most doctors want puncture wounds to be seen because of infection risk and to make sure that other structures in the foot are not damaged.) He was then going back and forth to the gate probably leaving lots of blood on the ground and in the car. Must be an impressive blood trail (blood trail clean up in garage) going to that gate. How far were the garbage cans inside that gate?
What kind of tool? It is easy to step on nails as they are often not really seen as an obstacle. But, a tool is tougher. If they were working on cleaning the garage, I would think the first thing to pick up would be those carelessly left, often expensive hand tools for woodworking.