Joe --
It's also our "job" to be sure each team has 5 players before we administer the throw-in, and to be sure the proper players are in the lower blocks before administering a FT, etc. Yet we wouldn't (I assume) have a "do-over" if a team violated one of these rules.
The "spot" mechanic / rule is no different. You *should* do it; failure to do so doesn't absolve the team from the responsibility to know. The player could always ask if you didn't give the instruction.
Note that this is different from giving the "wrong" instruction -- telling a player s/he can run when it's supposed to be a spot throw-in. In this instance, I think you can re-set.
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