I don't think it is unreasonable that a unit contacted as a result of pursuit could get a chance to respond, cards permitting (and of course they may also suffer bad things as a result of KaB test).
And I would hope we don't end up in a situation where e.g. two opposing units each break their frontal opponent and end up in only front corner to front corner contact; and then whoever moves first contacts the flank of the opponent and the opponent is denied a chance to respond effectively.