Considering your own duty, you should not waver. For for a warrior there is no greater good than a battle according to duty

One’s own duty (sva-dharma) supersedes general considerations. Avekṣya (having considered) — after all the metaphysical analysis, Arjuna must remember who he is.

Vicālayitum (to waver, to be agitated, to change position) is the prohibited action. The kṣatriya has specific duty: protection of dharma through force when necessary.

Dharmyāt yuddhāt (from duty-conforming battle) anyaḥ na śreyaḥ vidyate (no other good is found). The structure is absolute: for this caste, in this situation, there is no superior alternative.