Sion can use Summoner Spells during Glory un Death

During a Sion Jungle game I could use Flash and Smite during Glory in Death twice. It wasn't reliable, it didn't happen every time, but when it did happen I could use my summoners after the 3 second lock out. This was the game; http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2233590561/36886623?tab=overview. I didn't get screenshots.