Zuhayr compresses the experience of escalating tribal conflict into two aspects of a spear: an earlier point when resistance could still be checked and a later stage when the full violence of confrontation follows.
The verse is a warning about escalation rather than practical instruction in weapons. Yaʿṣi / yuṭīʿu supplies a concise verbal antithesis: one initially refuses, then is forced to submit to a harsher consequence.