• sampratīta smṛtayaḥ — regaining perfectly their memory
  sam (fully) + pratīta (recognized) + smṛti (memory). Gauḍīya: smṛti is one of the nine limbs of bhakti (smaraṇa). The boys regain smṛti not only of their own lives but, by Gauḍīya reading, of who Kṛṣṇa is. Memory of Bhagavān is bhakti's bedrock.
• samutthāya — rising up
  Absolutive of sam + ud + √sthā — to fully arise. Gauḍīya: utthāna means rising; samutthāya is the full rising. The same root that gives ut-thāpana — the priest's act of awakening the Deity each morning. The Lord here performs ut-thāpana on His devotees.
• jala-antikāt — from out of the water
  jala (water) + antika (near, edge). They rise from the water's edge. Gauḍīya: the spatial detail matters — they were never deep in the river, only at its edge. The poison was at the surface; their fall was at the bank. The Lord meets them where they fell.
• su-vismitāḥ — very surprised
  su (very) + vismita (astonished). Gauḍīya: vismaya — astonishment — is one of the sthāyī-bhāvas, the foundational emotions. In the gopī-rasa, vismaya is constant; the cowherds taste a small dose here.
• vīkṣamāṇāḥ parasparam — looking at one another
  vīkṣamāṇa (looking) + paraspara (mutual). Gauḍīya: bhakti-saṅga begins with looking at one another in shared astonishment — the gaze among devotees who have all received the same grace. The mutual look creates the Vraja-community.

• Whom have I not yet compared notes with about a recent 'we should have died' moment?
• Where would shared astonishment about the Lord's mercy build community right now?

Sleepers who do not know they fell asleep wake up confused, staring at one another, recalling nothing of the drift but everything of the wake. The boys and cows rise from the Yamunā's edge fully conscious, fully remembering — astonished, looking at each other. The verse names the gap between forgetting and remembering, with no perceived bridge. The Lord built the bridge; they wake on the far side.