Stuck at Chasm Ziggurat Windy Tower

I was wondering if anyone has experienced a glitch at the Chasm Ziggurat, where Lara is trying to fire a rope arrow into the portion of climbable rock that has just been made accessible by a lightning strike? Each time I shoot the arrow at the section of rock, Lara will hunch down to protect herself from the fierce wind blowing through the tower instead of tying the rope to the anchor post. No matter how close I am or on what side of the post, she will not tie up the rope. Since I think this is the only way forward, I'm stuck at this point unless I can figure out what is causing the glitch. Is she maybe just cold, and in need of a bomber jacket or something? Would that even solve the problem? In any event, I can't get back to a camp to even put on the jacket at this point.