• līlayā — playfully
  Instrumental of līlā — pastime, play. The single most important word in Gauḍīya theology. Every act of Bhagavān is līlā: even killing a wrestler is play, not labor. The grammar of the verse encodes the doctrine.
• sa - avajñam — with disregard
  Compound: sa (with) + avajñā (disregard, slighting). Balarāma kills without even granting Kūṭa the dignity of attention. Cf. BG 4.8 — paritrāṇāya sādhūnām — the same Lord whose face turns toward bhaktas turns barely an eye toward demons.
• vāma - muṣṭinā — with the left fist
  Compound: vāma (left) + muṣṭi (fist). The left hand is the non-favored hand in classical contexts — Balarāma chooses His non-dominant side. The detail is the verse's whole point: this much is enough.
• praharatām varaḥ — the best of those who strike
  Compound: praharatām (gen. plur. participle of pra + √hṛ, 'of those striking') + vara (best). Of all who strike, He is best — not by force but by economy. The Bhāgavatam pairs the descriptor with the left-fist detail: best, and barely trying.

• NRM SB 10-44-26-51
  Her Grace Narayani Mataji· English

• What 'Kūṭa-level' problems do you treat with the gravity reserved for major ones?
• Where could nonchalance be your spiritual default?

Kūṭa rushes at Balarāma, and Balarāma kills him līlayā — playfully, casually — with the left fist, as a man flicks a fly. The right hand is not needed; the gaze is barely engaged. This is Bhagavān's signature: the catastrophic act done with the unbothered hand.