• mumucuḥ — they released
  Perfect of √muc — to release. The same verb that names liberation (mokṣa). Gauḍīyas note the play: the flowers' release coincides with Śiva's release — both are mokṣa in different keys.
• puṣpa-varṣāṇi — rains of flowers
  Contiguous (puṣpa + varṣāṇi). Cosmic celebration. Same image of varṣaṇa Hari's voice carried in v.31 (amṛta-varṣiṇā). The chapter rains nectar through speech, and now rains petals through sky.
• hate pāpe vṛka-asure — the sinful Vṛkāsura having been killed
  Contiguous-join (hate + pāpe + vṛka + asure). Three locatives stacked: 'in (the event of) sinful Vṛkāsura being killed.' Bhāgavatam grammar of relief — the conditional cleared, the action exhaled.
• mocitaḥ — freed
  Past participle of √muc. Same root again. Mahādeva — Lord of liberation — is here the one liberated. The structural humility of the chapter: even Mocaka can need mocana, and Hari provides it.
• saṅkaṭāt — from the narrow pass / danger
  Ablative of saṅkaṭa. Fourth and final sounding of the chapter's drumbeat-word (v.13, 16, 22-context, here). The chapter ends saṅkaṭa-free; the doctrine has been performed.

When a quiet poison is finally drawn out of a kingdom's well, the gardeners come out and strew flowers over the courtyard — not because killing is happy, but because the threat was real and now is not. The devas, the pitṛs, the gandharvas all rain blossoms; Mahādeva is loosed from the saṅkaṭa that has shadowed the chapter from verse 13.