Highlights from Nampiḷḷai's vyākhyānam as documented by Vadakkuth Thiruvīdhip Piḷḷai:
pōzhdhu melindha - As the day was drawing to a close, as stated in "palitha prāyo vāsaraḥ" (Most part of the day had elapsed).
pun sekkaril - While the sky approached the dusk, marking the transitional time which was excluded in the boon granted to Hiraṇyakaśipu by Brahmā.