É como o livro de regras da primeira edição tratou da iniciativa para GMCs.
Da página 52 de Exércitos desconhecidos, 1e :
GM characters (GMCs) determine initiative in a different way that doesn't involve dice. All GMCs in this rulebook have either an (F) or an (S) next to their speed scores. (F) means failed and (S) means succeeded. All GMCs' initiative results are always equal to their Speed scores—as if they had rolled the dice and scored exactly their speeds—but the (F) or (S) indicates whether they go in the successful-initiative part of the round or the failed-initiative part of the round. As a rule, major GMCs get an (S) and minor ones get an (F).