Visiting keeper Maik Taylor received his marching orders five minutes before half-time for bringing down Simon Davies, but Teddy Sheringham's penalty leveller - following a Ledley King own goal on 15 minutes - was not added to in the second period.
"It was frustrating because we found ourselves chasing the game at 1-0. We slowly but surely started to play and get going - ending up with the penalty and them going down to ten men.
"We said at half-time that we had to work harder and go out there and play better. With ten men behind the ball it was not going to be easy but, quite frankly, the boys didn't go out there and respond.
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"The first ten minutes after the break is where I felt the reason lies as to why we didn't go on and win the game. Our decision making was a little bit too slow on the ball when we were looking to pass it, we didn't do enough overlaps and we didn't stretch them enough.
"We said they would get plenty of men behind the ball and we just needed that little bit of guile and somebody to produce a little bit of magic to unlock the door.
"It never really looked liked happening. When we did get in there, unfortunately, Milo has missed a bit of a sitter. He is as disappointed as anyone else in the stadium."
Glenn feels that the team's failure to respond to the numerical advantage in the first ten minutes after half-time cost us dear in not overcoming Fulham on Monday night.