Shrewsbury's bright start was rewarded with a third-minute breakthrough from Spanish striker Cristian Lopez who headed in Adam Reach's cross.
The hosts dominated the first half before Bean's shot just before the interval squirmed past goalkeeper Chris Weale.
"I think he's disappointed with it," said Turner. "He's got two hands on it and I know he will feel he should have kept it out. That was the crucial incident for us."
Turner was pleased with much of what he saw from his side in he first period but admitted he was perplexed how their level of their performance then fell away.
"I'm puzzled how we can play so well in periods and then don't look as though we can pass the ball," he stressed.
"I thought the first 44 minutes we played well and had a number of good situations we should have done better with.
"Perhaps in a period like that you have to kill the opposition off and then we've conceded such a bad goal right on half time and we looked very anxious in the second half.
"The longer the game went on you could see the anxiety creeping in and we didn't play particularly well in the second half at all.
"I was quite pleased with the first half but the goal at that crucial time didn't half set us back."
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