Is there any manner in baseball of stopping play when it's clear that a player has gotten injured? Im thinking of Friday night when Jeter hit the ball that DDJ hurt himself jumping up to field it. So, the player closest to the ball clearly goes down hurt and Jeter just happily rounds the bases, and the umpires are powerless to say "ball is dead" or some such?

That "inside-the-park home run" felt way cheap to me (and it's not like the Yankees have so little talent they need to use cheap shots to win). On the other hand, if the ball is still in play, Jeter has an obligation to hustle himself as far around the bases as he can. But could/should the umps have stopped play due to injury?