Bulls coach Frans Ludeke has questioned New Zealand referee Jonathon White's call of an extra time penalty to the Brumbies which effectively won the game.
The Brumbies won the match 23-20 after the Bulls had levelled the scores with a late penalty only to see the draw snatched from them by Brumbies flyhalf Christian Lealiifano's penalty after the hooter.
Match referee ruled that Bulls captain Pierre Spies for not releasing the ball in a ruck before Brumbies scrumhalf Nic White went off his feet.
Television replays showed an isolated Bulls player as well as White lying over the ball to indicate that the South Africans could also have been awarded a penalty.
The Bulls were enraged with the call and Bulls coach Frans Ludeke questioned the last play turnover from Brumbies replacement Colby Faingaa, saying he believed the Brumbies defensive line was offside at the time.
"Clearly offside, definitely, we just looked at it," Ludeke said.
"I've just seen those guys going before the ball is out, to charge Morne (Steyn) down, they knew Morne was going to kick.
"But you know that's the game, it would have given us another point, but that's life."
"We don't want to give it energy, the whole season is ahead of us, it was a great effort and we're going to go with that."
The Brumbies 2007 World Cup-winning Springbok coach Jake White said it was just one call that could have gone either way in a tough encounter.
"The margins are so small in this competition that those sort of calls, if they go for you that's fantastic," White said.
The Bulls return home to South Africa and have a by next week while the Brumbies host the Southern Kings.
Earlier in the match the Bulls had a try disallowed as the TMO replay showed winger Lionel Mapoe losing the ball as he crossed the tryline.