Fetching details from the dictionary...
point of a spear; spearhead
focus (of one's attack, criticism, etc.); aim; target; brunt
force (of an argument); edge
「鋒」 has other readings with different meanings.
批判の矛先が政府に向いた。
Criticism was aimed at the government.
矛先を変えて別の議題に移った。
We shifted the focus and moved to another topic.
怒りの矛先がなぜか自分に向いている。
For some reason, the anger is directed at me.