Terrell was on top and Lambotte had locked up around one of Terrells legs. Terrell had stretched Lambotte out and was attempting to get back behind him by grabbing the ankle and circling behind. Lambotte was stretched out on his belly holding on to Terrell's leg and waiting for Terrell to make a mistake so he could improve. Terrell was not using the ankle as a stall tactic, but rather to improve his position and secure control. I assume this is what Coach Johnson argued and the official changed the call to the correct call of stalemate.