He also noted a significant improvement by Dallas in faceoffs in the third period. St. Louis had won 14 of 18 faceoffs (77.8 percent) in the second period, but won 12 of 23 (52.2 percent) in the third. Dallas improved from 22.2 percent in the second to 47.8 percent in the third to 57.1 percent in overtime.
"When you're up two goals like that in a playoff game, or any time in a third period, you're subconsciously saying, 'OK, let's not give up the big play,'" Agnew said. "It's like a football prevent defense. You're not doing it; it's just subconscious. You don't want to give up the big goal.
"So you give a team like Dallas that sort of time and space, which they didn't have throughout the first two periods, for sure they'll make you pay and you could just see it coming."
Dallas started getting possession off those faceoff wins, which meant chasing the puck less.
Agnew feels the Stars still need to do better on the power play, including simplifying their approach, as the Blues have. But even so, the Stars were able to tie the score in the third period.
St. Louis won the game in overtime on David Backes' power-play goal.
"The momentum shifted a little bit," Agnew said. "I think St. Louis was certainly, I felt anyway, more determined in the overtime to attack and make things happen and [force] some penalties and the power play wins the game. I thought they were more determined. I thought the leadership group in the locker room did a good job of making sure they were ready to come out firing on all cylinders because they didn't want to go home down [2-0 in the series]."