Ok cool. It's fine then. IT was probably because it was preseason and there was no clarification on whether unsportsmanlike was called.
Still if it's something more severe. A guy basically has to carry himself to the free throw line and shoot in the playoffs.
I think it's always been that way but questionable whether officials call unsportsmanlike on dirty plays.
I don't think a referee would ever deem Wood's foul unsportsmanlike. The definition hereof is:
To be unsportsmanlike is to act in a manner unbecoming to the image of professional basketball. It consists of acts of deceit, disrespect of officials and profanity.
Wood basically elbowed Rozier in the face, wherefore the foul could either be assessed as a flagrant one or two:
Flagrant one:
If contact committed against a player, with or without the ball, is interpreted to be unnecessary, a flagrant foul—penalty (1) will be assessed.
Flagrant two:
If contact committed against a player, with or without the ball, is interpreted to be
unnecessary and excessive, a flagrant foul—penalty (2) will be assessed.
The referees probably interpreted the foul as only being unnecessary, hence a flagrant one was assessed. Therefore, Rozier couldn't re-enter.
Personally, I think that the NBA should reconsider the rule because (as you point out) it's kind of silly that a severely injured or bleeding player has to take the free throws in order to re-enter later on.