klasmalmstrom
Forum Guru
Note that A10.531 now (after ASL Journal 11 errata [red text]) says:
"For purposes of rout determination, Dash, concealment gain/loss, and Interdiction, an Open Ground hex is any hex in which the particular enemy unit(s) could apply, during a hypothetical Defensive First Fire opportunity (regardless of what attacks it actually made in previous phases), the -1 FFMO DRM. ..."
I.e., one considers if the units with a LOS could apply the -1 FFMO DRM in a hypothetical Defensive First Fire attack. Not if the -1 FFMO could apply in any hypothetical Defensive First Fire attack.
"For purposes of rout determination, Dash, concealment gain/loss, and Interdiction, an Open Ground hex is any hex in which the particular enemy unit(s) could apply, during a hypothetical Defensive First Fire opportunity (regardless of what attacks it actually made in previous phases), the -1 FFMO DRM. ..."
I.e., one considers if the units with a LOS could apply the -1 FFMO DRM in a hypothetical Defensive First Fire attack. Not if the -1 FFMO could apply in any hypothetical Defensive First Fire attack.