Tarik Cohen didn’t know how far he actually ran. The rookie’s punt return Sunday in a 15-14 loss to the at Soldier Field went into the game book as a 61-yard touchdown. fullback Michael Burton joked with Cohen on the sideline it looked like he ran 150 yards. The CBS broadcast estimated it was more like 127. It was enough that by the time Cohen was done flummoxing opponents, fans and media members with the roundabout return, he didn’t have much energy for his celebration. “The worst part was after I got in the end zone,” Cohen said. “The celebrating, that’s the most tiring part of the whole play.” Cohen acknowledged he never would be coached to make the play the way he did, and yet it turned into a rare bright spot in an otherwise brutal loss. The play was designed for him to eventually go to his left, but he was trying to set the defense up first. He caught Bradley Pinion’s 44-yard punt at the Bears’ 39-yard line, sprinted to his right and cut back to the 25-yard line with six 49ers defenders on his tail. He said their aggressiveness forced him back farther than he would have liked, something that “definitely” caused worry. But as he reversed field to his left and picked up speed, he found a slew of teammates ready to accompany him into the end zone for a 14-6 Bears lead in the second quarter. The touchdown made Cohen the first rookie to score touchdowns via rushing, receiving, passing and punt return in a season since Gale Sayers in 1965. The last player to accomplish the feat was Terry Metcalf in 1975. “I was worried that I might get tackled for a loss of yards,” Cohen said. “But in that case, just like my coaches always tell me, I’ve got to trust my speed, go with the plan and get back left.” The 49ers entered the game having allowed 2.5 yards per punt return this year, best in the NFL. They hadn’t allowed a punt to be returned for a touchdown either. Cohen said the Bears took that as a challenge. “That’s something you can’t coach,” said Bears running back Benny Cunningham, who made a key block. “He just has a special gift and a knack to make plays. … It was due time for him.” Only one thing made Bears rookie quarterback smile in his postgame news conference,