A 68-year-old male presents to clinic with complaints of low back pain for 4 days. The patient states that the pain started after moving around some heavy boxes in his garage. He denies any radicular symptoms or radiating pain. His past surgical history includes an open reduction and internal fixation of his right femur 2 years ago. His vital signs are currently within normal limits. Physical examination is significant for mild tenderness to palpation of the lumbar paraspinal musculature bilaterally. Osteopathic structural examination reveals a positive seated flexion test on the right. Palpation of the right sacral sulcus is more anterior than the left and the left ILA is more posterior than the right. Given the exam findings above, which of the following is the most likely somatic dysfunction exhibited by L5?