The ball crossed in front of Walton’s goal like a stone on a pond, bouncing off one Lambert player’s head then another and another, each a tantalizing and urgent possibility in the second or two it hung in the air. But the ball kept skipping across the field past the goal and to a Walton defender. The Raiders cleared it to midfield, then pushed it to Lambert’s half, and the final seconds ticked off the Longhorns’ 2-1 loss Saturday in the quarterfinals of the Class 7A state playoffs.