We present a product vibration-state-resolved study of the reaction O- + D-2 --> OD- + D over the collision energy range from 0.25 to 1.20 eV. At the upper end of this range, the OD- products are primarily scattered forward, with substantial vibrational excitation. At 0.37 eV and below, the products show both forward and backward scattered contributions, primarily in the nu’ = 1 state of OD-. We argue that this anomalous behavior is inconsistent with statistical partitioning of energy in a long-lived complex and discuss these results in the context of theory and experiment on the isoelectronic F + H-2 system.