Fast count:
If the marker does not say stalling to initiate or resume a stall count, counts at intervals of less than one second, or skips a number in the count , it is a fast count.
Skipping multiple numbers at once in the count is immediately callable as a general violation.
If a fast count occurs in such a manner that the thrower does not have a reasonable opportunity to call fast count before the first utterance of the word ten, the play is treated as a contested stall (XIV.A.3.b).