2011’s Screws Get Loose was such a grand execution of everything that Those Darlins stand for that even they knew it was time to pull back on the reins and contemplate for a while. Replacing guitarist Kelly Anderson with Adrian Barrera may not be as key to the modified sound heard throughout Blur the Line as hiring producer Roger Moutenot (Sleater-Kinney, Yo La Tengo) to overlook the sessions. But it’s not all a coincidence if you understand how a band operates. The band works slowly through many of these tracks, with “That Man,” in particular, taking on a ghoulish, freaky effect. “She Blows” picks up the pace, but with an oddly measured approach that restrains singer Jessi Zazu at the moment when you think she’s going to break out. As for playing with expectations, Blur the Line is a master performance. “Optimist” is more manicured pop than fuzzmaster ritual, and “Baby Mae” minimizes the garage rock organ and tremoloed guitars for the mellowest rock-out of the band’s career.