Spiders and Snakes

So apparently the 1973 Skylab
mission has a tennis connection

This is what I deserve for Googling 'snake tennis drill'. . . but this one is a cute idea from . Good for groups of 4-6 or more. Players should be able to rally.
www.ncacoach.org

Two players are designated 'spiders' and are stationed at the net. All others ('snakes') are lined up at the opposite baseline. Snakes play against the two Spiders one vs. two. Coach feeds first ball to Snake #1. Snake #1 cannot lob the first ball. Players play out the point. If Snake wins, Snake moves up to T and gets second ball fed. If Snake wins second point, he/she takes place of one of the Spiders, who now is one of the Snakes. When game is over, Snakes pick up all balls.

Original instructions did not specify which Spider is replaced by Snake who won 2 points in a row. Suggest the Spider who made the error is the one who is now a Snake.