Śrīmad-Bhāgavatam 10.44.12
Blended reading (Sanskrit + English inline)
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ātāmra
—
coppery-red
Compound: ā (slightly, fully) + tāmra (copper). The specific red of restrained rage — the eyes have changed color, but the face still smiles. Gauḍīyas read this as the signature of Saṅkarṣaṇa: power held in stillness.
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sa - amarṣam
—
with indignation
Compound: sa (with) + amarṣa (un-tolerance, just anger). Not krodha-as-passion but amarṣa-as-righteous-refusal-to-bear. Balarāma's anger is dharma-anchored, not reactive.
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hāsa
—
laughter, smile
From √has. The smile in the middle of battle — the same smile that lights Vraja. The Bhāgavatam will not let the Lord (or His expansion) lose His smile, even in the killing-verse.
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saṁrambha
—
absorption, vigorous engagement
From sam + √rambh. Total committed engagement — Balarāma's body is fully in the fight, but not consumed by it. Gauḍīyas note: bhakti is also saṁrambha — total engagement that does not lose the smile.
Out of anger, Balarama struck Mustika and became tired. He appeared splendid as he was absorbed in fighting, laughing out of anger.
Though Balarāma also has a tender body, seeing the fatigue of Kṛṣṇa he has become intensely angry. Look at that! Who does not see that? He laughs, out of disrespect for the wicked wrestler. His face is beautiful with his absorption in continuous laughter. Or he is beautiful with anger which gives rise to his laughter.
Balarāma's eyes — copper-red with anger, mouth bent in a small laugh — show the dual face of Bhagavān's expansion: the wrath that destroys demons and the smile that never leaves Him. He fights as one entertained. The composure is the menace.
My note
Source: vedabase.io