Averaging the ball's spatial trajectory over the 10 seconds following a pressure event on a specific player reveals the typical collective outcome of pressing that player — not just what they did in the instant, but where the ball ends up for the team. This technique captures both the pressured player's immediate response and the downstream passing/carrying chain that follows, making it a team-level metric, not just an individual one.
Correct construction: for every pressure event on a given player, record the ball's x,y coordinates at t=0 (moment of pressure), t=2s, t=4s, t=6s, t=8s, t=10s; average across all instances; plot the smoothed path. A clear forward trajectory means the team reliably beats this player's press and gains ground. An infield trajectory (like Alexander-Arnold's) is a predictable, potentially exploitable pattern.
The 10-second ball path after a pressure event captures not just the pressured player's decision but the entire team's collective response — where teammates move, who offers support, how the second and third passes route the ball. A team with consistently forward ball paths after pressure has a collective press-beating system, not just press-resistant individuals. Signing a press-resistant player into a team without collective press-beating movement won't change the ball path.