He was at a McDonald's and said, "I'm buying!" while surrounded by a crowd of fans. Then he left without paying. Trump isn't paying for anyones funeral.
I'm not even sure he should, morally speaking. It's not like the guy jumped in front of the bullet to save Trump. If Igot shot at by a crazed fan at a Taylor Swift concert I wouldn't expect her to pay my hospital bills.
I'd imagine that anything that breaks the laws of physics would be useful in some way.
It's pretty difficult to for me to imagine what those effects would be without imagining all of the other implications that come from a universe that has faster than light travel.