Honest awnser?
On the rare occaisions that I climb in to the ring to spar,instead of just bitching and complaining from the corner,I try not to fixate on any one thing.
Every fighter has a twitch that will tell you were they're going,but you got to figure out what it is
With Feur,I watch her rear shoulder,her eyes wont tell you a thing,with Tully(who's finally off of my s-list)I watch his hips,and his eyes,he will look where he's going and when he doesnt he'll wind up his hips,the other guy she spars with Jason,its his hands,he does a slight drop right before he throws