Illegal Substitution

[whistleman]

NFHS Rules

substitutions 8 for 18 throughtout the set. at match point coach subs 8 for 5. Umpire allows substitution - then realizes it is an illegal substitution. Calls it - for match point. There was no serve. What do you do as the up referee?

I reluctantly allowed it - as it was not a close game. I talked to the down ref and score keeper and said - you all have to catch that right away and just not allow the substitution.

I still feel we jacked that call. Please help.