• amedhya-mayam — full of abominable things
  Compound: a (not) + medhya (fit for sacrifice) + mayam (consisting of). The exact opposite of medhya — what cannot enter a yajña. Balvala's signature is to coat the sacred with the technically forbidden, the way Kali's signature is to introduce the inadmissible into every clean act.
• yajña-śālāyām — upon the arena of the sacrifice
  Compound: yajña (sacrifice) + śālā (hall, arena), locative. The exact spatial target. Demonic obstruction is not random vandalism; it targets the yajña-bhūmi, because every successful yajña delivers offerings to Viṣṇu. Gauḍīyas extend the principle to the modern temple, the kīrtana-hall, the bhakta's japa-seat.
• śūla-dhṛk — carrying a trident
  Compound: śūla (trident) + dhṛk (bearer). The trident is Śiva's weapon; Balvala wields a perverted copy. The verse subtly tells us that the demonic always parodies the divine — he imitates the symbols of authority while opposing the Person they serve.
• balvalena — by Balvala
  Instrumental of Balvala. The name resembles bala (strength) but means the bloated, the obstinate. He is brute force without surrender — a study, by contrast, in what Bala-rāma is: bala that is also rāma, strength that gives delight.

• When opposition tries to disgust me, what helps me stay centered enough to respond?
• Where could I refuse to be derailed by ugliness before the actual fight?

Balvala arriving trident-in-hand onto the sacrificial ground is like a saboteur walking into a temple kitchen during ārati and tipping the offering plates into the gutter. The yajña-śālā is meant to be the most protected square of earth on the planet; the demon's whole existence is to make that square the dirtiest. Balarāma's plow is already lifting before the sages can finish their prayer.