Schools’ Cup favourites Methody needed an injury time try to snatch victory from a determined Wallace High.
It wasn’t the scenario that the Belfast team had expected and it will have done their morale little good before they face a buoyant Campbell College in the quarter-final at Fox's Field in a fortnight.
Methody were 10 points in front early on after Mark Gribben converted his own try and kicked a penalty, but gradually the young Wallace team started to gain confidence and took the game to their opponents.
Winger Jordan Heatley brought Wallace back into the contest when he gathered around the 10-metre line and with sheer speed he side-stepped through for a try which David Scott converted.
Following a line-out in mid-field the ball was passed along the backs and Heatley, who surprisingly has never represented his Province, again showed his capabilities when he weaved through the Methody defence to put his team 14-10 in front.
Wallace were dominating and were rewarded further 15 minutes into the second period when Matthew Ballantyne ran in another try.
Methody were struggling, but eventually they put their game together and with 12 minutes remaining winger Peter Colhoun crossed to reduce the deficit, making it 15-19 in Wallace's favour.
Methody's confidence had returned, but Wallace showed strength of character and it looked as though they were going to hold out for victory.
It was not to be though as after the referee played an extra seven minutes Colhoun raced in for his second try and that brought proceedings to an end.
It was a fantastic effort by the underdogs who had only five Upper Sixth players on the pitch.
Wallace coach Neil Hinds said: “We played our hearts out and it all came down to a try in the 42nd minute. If we had lost by 20 points it wouldn't feel so bad.
“We had prepared a lot for this round having played four difficult away games.
“It was not the result we wanted, but we came close and wish Methody all the best.”