Confirm with tag volunteer — next finisher should be
Numbers don't match?
Hold the next tag(s) back — don't hand one out until the tag count catches up to the finisher number above.
Tap below once for each finisher whose tag was missed — separate from the main Finisher button, so these get flagged in the results.
Timing ended
Don't forget to turn Airplane Mode back off (and restore brightness/other settings) now that timing is finished.