• aṣṭā-viṁśa — twenty-eight
  Compound: aṣṭā (eight) + viṁśa (twenty). The same number that names this very Canto (10) and chapter (56) sequence in some reckonings; 28 ahas of fight is a deliberate, almost ritual count — long enough to exhaust the great devotee fully.
• muṣṭibhiḥ — with fists
  Instrumental plural of muṣṭi. Bare fists — no weapons, no māyā. This is the simplest possible combat, body to body. Kṛṣṇa engages His devotee with no trick, no aiśvarya — only steady contact.
• vajra-niṣpeṣa — like the blows of lightning
  Compound: vajra (lightning, also Indra's weapon) + niṣpeṣa (crushing blow). The same vajra that Indra wielded against Vṛtra in the Bhāgavatam. Jāmbavān throws Indra-grade blows; Kṛṣṇa receives them as if they were rose-petals — until Jāmbavān realises whom he is hitting.
• aviśramam — without pause
  Compound: a (not) + viśrama (rest). Bhagavān's tirelessness in receiving the devotee's confusion — this is one of the chapter's most tender doctrinal images. He never tires of being mistaken; He simply waits.

• Padaseva Pr SB 10-56-24 Oriya
  His Grace Padaseva Prabhu· Oriya

Twenty-eight days of fists like lightning — Bhagavān could end this in a syllable, but He lets the devotee tire himself completely. Sometimes grace's longest mercy is to outlast our resistance until we collapse into recognition.