The ability to play a ball immediately after it bounces at or near your feet — either on return of serve against a hard deep serve, or during transition when a volley gets down to your feet. A critical emergency shot for surviving the transition zone.
Get low — bend the knees deeply. Drop the paddle down in front of you to where the contact will be. Keep a very compact backswing — the ball already has plenty of energy, you don't need to supply more. Move toward the shot, not away from it. Against hard serves: stand your ground, don't back up. Grip pressure: firmer on backhand (7-8/10) because the wrist is in a weaker position; forehand can be lighter (3-4/10) since the wrist is naturally stronger. Step toward the target as you make contact.
Against a hard deep serve, every instinct says back up to buy time. This is exactly wrong. Backing up shifts weight to the back foot, which angles the paddle face downward into the net. The correct response is counterintuitive: stand your ground, bend your knees, drop the paddle to the contact point, and step TOWARD the shot. The ball has more than enough energy — you're just redirecting.