AN ACR PILOT REPORTS A TWR COMMANDED GAR ON VERY SHORT FINAL AFTER ANOTHER ACR ACFT FAILED TO CLR THE ACTIVE RWY.

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WE WERE CLRED TO LAND AT ZZZ. APPROX 1 SECOND BEFORE MAIN WHEEL TOUCHDOWN; ZZZ TWR ISSUED AN URGENT AND IMMEDIATE GAR INSTRUCTION. WE IMMEDIATELY BEGAN A GAR (MAIN GEAR HAD TOUCHED DOWN) AND WERE AIRBORNE PRIOR TO INTXN OF RWYS X AND Y. AT INTXN OF RWY X AND TXWY; WE SAW AN ACFT PARTIALLY EXTENDING ONTO RWY X. AFTER THE MISSED APCH AND SUBSEQUENT LNDG; I PHONED THE TWR AND FOUND OUT THAT THE OTHER ACFT HAD MISSED A TURN AND INADVERTENTLY CROSSED ONTO RWY X WITHOUT CLRNC. SUPPLEMENTAL INFO FROM ACN 745710: AT 30 FT I PULLED THE THRUST LEVERS TO IDLE; TO ALLOW THE ACFT TO SETTLE AND I BEGAN TO FLARE. AT APPROX 1 SECOND PRIOR TO MAIN GEAR TOUCH; THE TWR CTLR IN A VERY LOUD AND URGENT TONE OF VOICE SAID; 'ACR X GAR!' OR SOMETHING LIKE THAT. AFTER HEARING THAT; I IMMEDIATELY PRESSED THE GA SWITCHES AND ASSISTED THE THRUST LEVERS TO THE GA PWR POS. AT THAT POINT THE MAIN GEAR TOUCHED THE RWY. I MAINTAINED THE NOSE IN AN UP ATTITUDE AND WE ALMOST INSTANTLY WERE AIRBORNE AGAIN. I ESTIMATE WE WERE 25-30 FT AGL WHEN WE PASSED THE ACFT ON THE TXWY.