Point Of Spear
Spearpoint, Brunt
noun
The spear ahead is the most ahead part of the halberd. That's the point of spear or spearpoint.
The reading comes from the vocab versions of 矛 and 先 combined together.
でも、どうしてハッカーは攻撃の矛先を俺たちに向けてきたんだ？
But, why did the hackers aim the brunt of their attack at us?