• apa - ṛtu — out of season
  apa (away from) + ṛtu (season). The marker that this is not nature but transgression. Ṛtu in Vedic order is dharmic; apa-ṛtu is adharma. Kṛṣṇa's diagnosis identifies the storm as ontologically misplaced.
• asmābhiḥ — by Ourselves
  Instrumental plural — the royal 'We.' Kṛṣṇa accepts authorship of stopping Indra's yajña (chapter 24); the līlā unfolds from that acknowledged act. Gauḍīyas note: He never disowns His provocations, because each is medicine for someone's pride.
• nāśāya — for destruction
  Dative of nāśa (destruction). Indra's intent is destruction — Kṛṣṇa speaks Indra's purpose without softening it. The rasa-grammar of the verse is calm clarity; the cowherd boy speaks like a king who has already decided.
• varṣati — is raining
  Present indicative of √vṛṣ. Indra, whose name as Parjanya is the rain itself, is now described by the very verb he embodies — and bent against Vraja. The grammar shows the offender consumed by his own function.

• BKG SB 10-25-15-17 - Coming in touch with Krsna is purifying - 2019-10-04 Suva
  His Holiness Bir Krishna Goswami· 2019-10-04· English

• What current 'storm' do I refuse to name as flowing from a decision I (or He) made?
• Where would honest causal naming free me to respond rather than confuse me into freezing?

Kṛṣṇa names the cause out loud, as a physician names the disease before treating it. 'This is Indra's work — out-of-season, fierce, full of stones.' Naming is half the cure: it strips the storm of its disguise as nature and reveals it as an offended ego's tantrum.