CTLR TRAINING IN PROGRESS. MULTIPLE RWY OP INTERSECTING RWYS. SMT Y ISSUED GAR TO MAINTAIN STANDARD SEPARATION FROM ACR X.

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ACR X WAS CLRED FOR TKOF ON RWY 18. THE TWR ADVISED US OF TFC ON A 2 MI FINAL FOR RWY 21. AT ABOUT 100 KTS I SIGHTED THE ACFT ON APCH TO RWY 21 OFF TO OUR L. THE ACFT WAS AN SMT ON A VERY SHORT FINAL TO RWY 21. IT WAS OBVIOUS TO ME THAT WE WERE GOING TO ARRIVE AT THE INTXN OF RWY 21 AT THE SAME TIME AS THE SMT. JUST BEFORE INITIATING REJECT PROCS A DIFFERENT CTLR'S VOICE TOLD THE SMT TO MAKE AN IMMEDIATE L TURN. THE SMA'S PLT COMPLIED IMMEDIATELY SO WE CONTINUED OUR TKOF. WE WERE VERY HVY AND AT THE POINT I WOULD HAVE REJECTED WE WOULD HAVE BEEN OVER 120 KTS WHICH WAS STILL BELOW V1 BUT WOULD HAVE BEEN A VERY DIFFICULT PROC; PROBABLY RESULTING IN BLOWN TIRES. I BELIEVE THAT SOME SORT OF CTLR TRAINING WAS IN PROGRESS AT THE TIME. UNFORTUNATELY; THIS SORT OF INCIDENT IS NOT AT ALL UNCOMMON. WORDS LIKE 'IMMEDIATE' AND 'EXPEDITE' ARE ALL TOO COMMON AT BUSY ARPTS. PERHAPS THE ANSWER; HOWEVER UNPOPULAR; WOULD BE TO LIMIT ACCESS TO SOME OF OUR BUSIER ARPTS AND ALSO STAFF OUR CTL TWRS WITH ENOUGH EXPERIENCED CTLRS.