The story about St Kieran has him turn the giants to stone when they don’t listen. Perhaps this is a bit of a joke, because the 6th century saint never left Ireland (from Burl’s Carnac to Callanish). Maybe this is a bit like the folklore motif of stones moving when they hear the church clock (stones can’t hear – or else the church doesn’t have a clock). Otherwise, a bit unfair as I’m sure his voice wasn’t loud enough for the giants to hear.