• āsphotya — slapping (His arms)
  Tala-śabda, the wrestler's challenge-slap. Kṛṣṇa adopts the warrior-idiom of the akhāḍā — a foretaste of the Mathurā wrestling match that the rest of this chapter sets up.
• acyutaḥ — the infallible one
  A (not) + cyuta (fallen). One of Kṛṣṇa's foundational names — never fallen from His position, never failing His devotees. Used here exactly when He demonstrates that He cannot be moved.
• sakhyuḥ — of a friend
  Sakhā — the cowherd boys. Sakhya-rasa is named in the very moment of combat. Vraja's emotional grammar is preserved across every kind of action.
• bhuja — arm
  Bhuja-ābhogam prasārya — stretching out the arm-coil. The arm is described almost as a separate creature (serpentine, vast), an emblem of the Lord's playful display of His own form.
• hariḥ — Lord Hari
  Hari — the one who takes away (sins, fears, demons). The name is used in moments of removal; here, Ariṣṭa's life is what is about to be taken.

• Where could you face a current problem with Kṛṣṇa's relaxed shoulders rather than tense ones?
• What does it mean to 'show contempt' for evil without losing your composure?

He slaps His arms and rests one of them on a friend's shoulder. The casual sakhya-gesture in the middle of a fight is itself the doctrine: Kṛṣṇa never leaves His sakhā-bhāva even when killing a demon. His arm on Śrīdāmā's shoulder is more central to the scene than the bull is.