Yep, additz is quite right.
The reference for recoiling is on page 40, Recoiling Elements, third paragraph: If a recoiling element meets a friendly element...it cannot pass through and is facing in the same direction, then...if land troops it pushes back any but Elephants, War Wagons, Baggage or naval.
The reference for the destructive effect of Wb in close combat is also on page 40, Destroyed Elements: When an element other than Psiloi is destroyed as a close combat outcome, all friendly elements with any part directly beyond the initially destroyed element and with their nearest such part less (or if Psiloi no further) than the initially destroyed element's base depth from the initially destroyed element, are also destroyed if...they are foot, and the destroyed element's frontal opponent was Warband.
Not one of Barker's better pieces of English. And, disappointingly, there isn't an illustration to clarify all this verbiage at the back of the book.