Derryvree’s paired tills reveal a striking pattern: an ice-free freshwater wetland emerged between glacial advances, demonstrating that Late Pleistocene Ireland contained changing, localised habitats rather than one uniform environment. This raises an intriguing question about whether such temporary ecological mosaics could have offered routes, resources or stopping places for mobile hunter-gatherers, especially alongside the tentative evidence of reindeer processing at Castlepook. Yet the article rightly distinguishes possible visits from established settlement, and stresses chronological uncertainty. How might archaeologists combine local environmental sequences, animal remains and dating to assess whether brief human activity was feasible in Ireland during this unstable period?