Was Ximen Chuixue's hit on Ye the one exception?

[CC]

AFAIK, XMCX always kills with a clean stab at the throat.

In his duel with Ye Gucheng, his stabbed at the heart instead.

Was that the one and only time he did not go for the throat during a kill?

[kyss of the sword]

he always aims where there is a weakness, since there is no move without a weakness he just follows the flow and hits were it's most convient. when fighting with the e-mei leader, he was in a bad spot because the e-mei leader was able to shift his weak spot around at will. when XMCX and YGC fought, their swords were changing position several times in the initial thrust, the heart was the final spot were xmcx could strike cleanly.