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About Nehe Lesson30 qeustion

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In idle() function, if (TestIntersionPlane(pl1,OldPos,uveloc,rt,norm)) { //Find intersection time rt4=rt*RestTime/rt2; //if smaller than the one already stored replace and in timestep if (rt4<=lamda) { if (rt4<=RestTime+ZERO) if (!((rt<=ZERO)&&(uveloc.dot(norm)>ZERO)) ) { normal=norm; point=OldPos+uveloc*rt; lamda=rt4; BallNr=i; } } } In the code segement, "!((rt<=ZERO)&&(uveloc.dot(norm)>ZERO" I don't understand. In my opinion, uveloc.dot(norm)>ZERO condition is not neccessary for rt must be > 0 if TestIntersionPlane return ture. I don't understand why (uveloc.dot(norm)>ZERO is used?

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