On Bhagwad Gita: What is it to act just as an apparent cause (‘Nimitt Maatr’)?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

तस्मात्त्वमुत्तिष्ठ यशो लभस्व जित्वा शत्रून्भुङ् क्ष्व राज्यं समृद्धम् ।

मयैवैते निहता: पूर्वमेव निमित्तमात्रं भव सव्यसाचिन् ।। 11.33 ।।

tasmāt tvam uttiṣhṭha yaśho labhasva jitvā śhatrūn bhuṅkṣhva rājyaṁ samṛiddham

mayaivaite nihatāḥ pūrvam eva nimitta-mātraṁ bhava savya-sāchin

Therefore do thou arise and acquire fame. Conquer the enemies, and enjoy the unrivalled dominion. Verily by Myself have they been already slain; be thou merely an apparent cause, O Savyasachin (Arjuna).

~ Shrimad Bhagavad Gita, Chapter 11, Verse 33

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Questioner (Q): What does it mean to be an apparent cause, ‘Nimitt Maatr’? Who becomes the Nimitt Maatr? Is it the body-mind complex that we think we are? Why should we become…