Hibs moved upfield and JonathanGrounds' low cross was not fully dealt with by Enckelman but the St Johnstone defence eventually scrambled the ball away.
Riordan immediately released JonathanGrounds, whose low cross was well saved by goalkeeper Marian Kello with a forest of Hibs boots waiting to turn the ball into the net.
The Sports Grounds Safety Authority Bill, proposed by Tory MP Jonathan Lord, was given an unopposed third reading and now goes to the Lords for further consideration.