Brentford hit United's goal-frame four times and Frank said: "How we didn't win this game is incredible. It was the most one sided 1-1 game we were not winning. It was incredible that we were not winning.
"Performance? Wow. We had many players out, this is a unique group of players. It was not dropping for us but to have the mentality and character to come back into the game, these players are fantastic.
"I am very proud of the players.
"Of course you think that, but everything looked well. We were playing at home, we were playing very offensively to go for the win. We did everything we could but unfortunately this is football and only one point.
"We just need to keep going."
He also said: "There should have been only one winner in the game, that could only be us. Then you go 1-0 down in the 96th minute and you think football is brutal. I almost lost faith in the football god but he gave a bit back.
"What a performance. We had our entire back four out. We completely dominated the game and there could only be one winner.
"These players deserve so much praise. They are a fantastic group of humans to work with.
"We had the most shots ever in the Premier League. How we didn't win is incredible.
"It dropped for the right players that you want it to drop for, but that is football.
"I am very, very happy with the performance. It was more or less the perfect performance."