• gadayā — with His club
  Kaumodakī, Kṛṣṇa's mace — one of His four āyudhas (śaṅkha, cakra, gadā, padma). Gauḍīyas read the four weapons as four functions of Bhagavān's protection; the gadā corresponds to direct destruction of egoic resistance.
• bhīma-vegayā — of frightful speed
  Compound: bhīma (terrifying) + vega (speed). The instrumental case stresses how the club is wielded — not heavy and slow, but terrifyingly swift. Kṛṣṇa's danda is never sluggish.
• jatrau — on the collarbone
  The precise anatomical target — jatru, the clavicle. Bhāgavatam's surgical exactness about where the blow lands shows that even in fury, the Lord strikes a chosen point, not a random region.
• vaman asṛk — vomiting blood
  Compound phrase: vaman (vomiting) + asṛj (blood). The demon's reply to a Kṛṣṇa-strike is always rakta — a Bhāgavatam pattern from Pūtanā to Bakāsura to Śālva: the dark stuff inside the demon comes out at the Lord's touch.

• Where am I expecting only quiet from the Lord when the situation calls for decisive action?
• How do I make space for the more forceful side of His mercy?

One swing of the club — fast, terrifying — lands on Śālva's collarbone; he trembles and vomits blood. The Lord's reply to a long taunt is a single action. After enough talk, bhakti closes the conversation with one stroke of decisive grace.