At the levels I work, I agree; do not call time for an injury until the conclusion of the play.
I suppose at younger levels, say 9-10 year olds, I would expect the umpire to use some descretion with a serious injury and I could forsee the possibility of time being called prior to the end of play to allow junior to be attended to.
It would then be up to the umpires to place runners, etc. to minimize any advantage/disadvantge resulting from the calling of time.
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