Useful (Avengers/Supernatural Crossover Fanfiction)

This universe is a bit different from the one we all know and love. In this particular universe, Pietro does get shot in Sokovia, but he doesn't die. He does however, lose his ability to run or use his speed in any useful way. He can't be an Avenger, but he does his best to do what he can to help. The other Avengers d...