@Riot, What is the conditions for Sion's special quotes?

Specifically, the ones that are in the "Uncategorized" section of his Wiki page? They sound awesome, but I want to know what triggers them.

For Example: http://vignette2.wikia.nocookie.net/leagueoflegends/images/8/8c/Sion.moveInnate01.ogg/revision/latest?cb=20140929215948

http://vignette4.wikia.nocookie.net/leagueoflegends/images/f/fe/Sion.moveInnate03.ogg/revision/latest?cb=20140929220016