[ozzy6900]

OBR 5.09 The ball becomes dead and runners advance one base, or return to their bases, without liability to be put out, when—

(b) The plate umpire interferes with the catcher’s throw; runners may not advance.
NOTE: The interference shall be disregarded if the catcher’s throw retires the runner.

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FED 5-1-2c
ART. 2 ... It is a delayed dead ball when:
c. umpire interferes with the catcher who is attempting to throw

FED Casebook
5.1.2 SITUATION C: With R1 on third, R2 on first and no outs, R2 attempts to steal second. F2 is obstructed on his throw to second base by the plate umpire.The throw is cut off by the shortstop and relayed back to the plate in time to retire R1 trying to score.

RULING: If an out was not made at the end of F2's throw, the umpire shall call the ball dead immediately. Both runners shall return to the bases occupied at the time of the interference.

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NCAA Rule 6

Delayed Dead Ball—Runners Return or Advance
SECTION 3. The ball becomes dead and base runners return when:

a. The plate umpire interferes with the catcher’s attempt to throw
anywhere

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Unfortunately, the NCAA penalty is in reference to the batter interfering with the catcher and there is no reference to the umpire interfering in the penalty. I would assume that NCAA will agree with OBR & FED that if the catcher's throw retires the runner, the interference will be ignored.