I must admit I didn't hear the chanting.
I saw the stewards escort someone out of the ground shortly after the first smoke bomb went off. Then after the game behind the East Stand there was a very drunken Widnes fan shouting questions as to where the Widnes bus was. Since he was clearly at the wrong side of the ground straight after the game finished I'm assuming he could be the one who was escorted out during the match. Don't our stewards still have video cameras on their clothing?
Also wasn't there a video of the Widnes fans letting the smoke bomb off on Facebook. I think it might have been on The 18th Man page.