I found a very injured bird, what should I do to help it?

I was walking home from school and found a pigeon with wings ripped off and it was in very bad shape. I called the closest animal hospital, and they said they could humanely euthanize it, which I agreed to, because this bird is in too much of a critical condition to survive any procedure etc. and I would rather it not suffer. The problem is, my father doesn’t come home until half an hour to an hour from now, and I can’t drive. What are some things I could do in the meantime? (I’ve already given it water through a dropper)