When the wrestler kicked in his left leg the back point count should have started, the reversal, control and beginning of back point count happen simultaneously - it was close. It is no different than a feet to back takedown. The only question would be the timing of when the bottom wrestler broke back off of 45 degrees/exposure or criteria. The hand signals by the ref indicated a 2 count. I have always said leave no doubt in the officials eyes - another 1 second hold in that position would have left no doubt - tough call.
I did have the benefit of multiple reviews with no heat during a battle.