B747 CREW HAD RWY EXCURSION IN A XWIND DEPARTING VHHH.

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I WAS CAPT GIVING IOE TRAINING TO FO WHO WAS PF. WIND CONDITION AT TKOF WAS STRONG XWIND ABOUT 70 DEGS OFF NOSE; WITH WINDSHEAR RPTED. FO WAS EXTENSIVELY BRIEFED ON SPECIALIZED TECHNIQUE REQUIRED FOR HANDLING TKOF ROLL; ROTATION; AND INITIAL CLBOUT IN STRONG XWIND (UNUSUAL TKOF ROLL RUDDER INPUT; WINGS LEVEL ROTATION TO CLR ENG PODS; AND PROMPT TURN INTO WIND AFTER POSITIVE RATE ESTABLISHED). NEVERTHELESS; UPWIND WING WAS TO RISE (ABOUT 7 DEG BANK ANGLE) SHORTLY AFTER ACFT AIRBORNE; CAUSING AN ACFT DISPLACEMENT JUST OUTSIDE RWY EDGE. ACFT WAS RETURNED TO RWY BOUNDARY BY RWY END. AS INSTRUCTOR; I SHOULD HAVE IMMEDIATELY PROVIDED AILERON INPUT TO REMOVE THE INADVERTENT BANK AND FLOWN THE ACFT BACK TO CTRLINE; INSTEAD OF WAITING FOR FO TO DO IT. THERE WAS A MOMENT OF HESITATION AND SURPRISE ON MY PART AT THIS DEV; SINCE THIS FO HAD ALREADY DEMONSTRATED EXCELLENT KNOWLEDGE; FLYING SKILLS; AND SITUATIONAL AWARENESS; BUT THIS TKOF WAS ASKING A LOT FROM A STUDENT JUST COMING INTO THE SEAT AFTER SEVERAL YRS AS A FE. THIS SHOWS ME THAT I HAVE TO BE MORE POSITIVELY 'AT THE READY' FOR INTERVENTION; REGARDLESS OF THE QUALITY OF THE OTHER FLYING CREW MEMBER AT THE CTLS.