What Haku, What Gaara, What distance and What knowledge?
Don't even answer Gaara stomps. No indication of Haku being able to control ice that's not the one he makes
Wait wasn't there a scene in Zabuxa Arc of little Haku showing the Yuki clan KKG and was manipulating snow on the ground or was that only in the anime?
Haku can make Gaara's sand useless by freezing it.I hontesly don't remember. Maybe you have a point.
Still i don't think Haku stands a chance. He makes a special Ice with his chakra. Normal manipulated ice would not be as good, as with Gaara's sand. And not even his own ice can hurt Gaara, so how would manipulated ice help¿?
Haku can make Gaara's sand useless by freezing it.