The Cman adds an addition RT to an ambush or regular swing that reduces the stance from offensive to a possible low of guarded immediately after the dRoll for their physical AS strike. It would work potentially like this:

Rank 1 +5 RT Stance Lowered 1 (no lower than Nuetral...example Advanced down to Forward)
Rank 2 +4 RT Stance Lowered 2 (no lower than Neutral)
Rank 3 +3 RT Stance Lowered 3 (no lower than Neutral)
Rank 2 +2 RT Stance Lowered 4 to a low of Guarded
Rank 1 +2 RT Stance Lowered 4 to a low of Guarded