Certainly, just minutes into the second half when Jason Euell doubled the advantage for Charlton, even a draw did not look on the cards. But the team preserved their recent unbeaten record and could have won the game in a stirring finish.
"I've got mixed emotions on that one," reflected Glenn. "If you asked me at half-time or just after I'd be saying it is a good point, but the way we played in the second half I'm not sure.
"With the two chances as well - one cleared off the line from Steffen and Robbie's right at the end - we're disappointed we haven't got the three points. We played very well in the second half after playing poorly in the first.
"It just shows you that 90 minutes is a long time, it can ebb and flow and we finished on the front foot."
The boss credits substitutes Simon Davies, Les Ferdinand and Steffen Iversen for changing the course of the game.
"We started sloppy and a bit lethargic, but the three subs that went on really affected the game and were fresher.
"At the end of the day, from where we were at 2-0 down, we've got to be pleased that we've kept an unbeaten run going."
Glenn described himself as having 'mixed emotions' when asked if the Boxing Day draw with Charlton was a point won or two dropped.