B747-400 FO LOST CTL OF THE ACFT ON A XWIND TKOF AT VHHH.

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TKOF RWY 25 ALMOST EXITED RWY NEAR V1 AS FO (FLYING) RUDDER APPLICATION INSUFFICIENT TO HOLD RWY. I (CAPT) TOOK OVER CTL OF ACFT NEAR V1 AND RETURNED ACFT TO CTRLINE AND CONTINUED TO TKOF; RETURNING ACFT TO FO AFTER STABLE IN CLB. AFTER TAKING OVER CTL; I DID NOT THINK WE WERE GOING TO STAY ON RWY FOR A COUPLE OF SECONDS. ONCE CTL ESTABLISHED; ALMOST ABORTED AS SAW WE WERE STILL V1; 5 KTS BUT RWY LOOKED KINDA SHORT NOW SO CONTINUED TKOF. THOUGHTS: FO LOOKED TENTATIVE AT TKOF. SHOULD HAVE INQUIRED MORE. HE SEEMED UNSURE. I THOUGHT WE HAD BOUGHT IT! SUPPLEMENTAL INFO FROM ACN 517149: DAY; VMC TKOF ROLL ON HKG RWY 25L; FO WAS FLYING; I WAS RELIEF PLT DIRECTLY BEHIND FLYING FO. L TO R XWIND OF ABOUT 15 KTS. TKOF ROLL SEEMED NORMAL UNTIL APCHING V1; WE QUICKLY BEGAN TO VEER TO THE L AND L WING CAME UP SIGNIFICANTLY. I GLANCED AT FO'S CTL INPUT AND SAW ABOUT 20 DEGS OF YOLK DISPLACEMENT TO THE R. THE ACFT GOT AIRBORNE BRIEFLY; THEN STRAIGHTENED OUT; MOVED BACK TO CTRLINE AND LANDED AGAIN; CONTINUING THE TKOF ROLL; NOW ABOVE V1 BUT BELOW VR. THE ACFT ROTATED AT VR AND FLEW AWAY.