Glasner says it was a typical game of two halves.
He explained: "It's an easy summary: in the first-half we needed a great goalkeeper, and we had a great goalkeeper with Dean Henderson.
"He kept us in the game, he kept us alive, because the first-half was 100 percent how we don't want to play, and we needed clear words at half-time.
"It was very positive that the players could switch their mindset, not about tactics or anything, it's just their mindset to be competitive and play forward and not play so cautiously like we did in the first-half.
"And then at the end, with the chances in the second-half, I think the point is okay for both teams."
On his changes at halftime, Glasner continued: "Our subs have always had impact in the last games, and this is how a team works – maybe the players are still a little bit tired or not in their best shape, but then it's for everyone to be ready to help support the team.
"Ismaïla Sarr was (brought on) because we needed more runs in behind, more directness to the goal, and he did great, and Jeff Lerma, because we lost too many duels in central midfield in the first-half.
"We needed physical presence and also his experience, and he also did great, together with all the other team-mates, and we could see a completely different second-half.
"I think the clean sheet on both sides is the responsibility of two unbelievable goalkeepers today.
"But in the second-half we did much better, and we have now two full weeks to train. We didn't have it until now, because we can see there's too many things that are not clear for everyone, there's not the synchronicity we need, and so this is what we will work on in training: in possession, out of possession, set plays.
"We were struggling in any part of the game in the first-half, but we could control it much better in the second-half."