جَاءَ شَقِيقٌ عَارِضًا رُمْحَهُ
Shaqīq came displaying his spear.
The display of the spear suggests readiness for combat and an assertion of strength. Shaqīq need not have verbally denied the strength of the other side, but the gesture can imply that he underestimates them.
The respondent therefore treats him as though he denied the opposing strength. The rhetorical force depends on reading both lines together: the first supplies the sign, and the second responds with reinforcement.